{
  "C++模板初始化": {
    "prefix": "cpp",
    "body": [
      "#include <bits/stdc++.h>",
      "using namespace std;",
      "#define endl '\\n'",
      "int main() {",
      "    // 加快读入",
      "    ios::sync_with_stdio(false), cin.tie(0);",
      "    $1",
      "    return 0;",
      "}"
    ],
    "description": "C++模板文件"
  },
  "定义长整型为整型": {
    "prefix": "ill",
    "body": [
      "#define int long long"
      "#define endl \"\\n\""
    ]
  },  
  "C++模板初始化2": {
    "prefix": "init",
    "body": [
      "#include <bits/stdc++.h>",
      "",
      "using namespace std;",
      "#define int long long",
      "signed main() {",
      "    $1",
      "}"
    ]
  },  
  "快读": {
    "prefix": "read",
    "description": "快读",
    "body": [
      "//快读",
      "LL read() {",
      "    LL x = 0, f = 1;",
      "    char ch = getchar();",
      "    while (ch < '0' || ch > '9') {",
      "        if (ch == '-') f = -1;",
      "        ch = getchar();",
      "    }",
      "    while (ch >= '0' && ch <= '9') {",
      "        x = (x << 3) + (x << 1) + (ch ^ 48);",
      "        ch = getchar();",
      "    }",
      "    return x * f;",
      "}",
    ]
  },
  "快读快写": {
    "prefix": "rw",
    "body": [
      "//快读快写",
      "LL read() {",
      "    LL x = 0, f = 1;",
      "    char ch = getchar();",
      "    while (ch < '0' || ch > '9') {",
      "        if (ch == '-') f = -1;",
      "        ch = getchar();",
      "    }",
      "    while (ch >= '0' && ch <= '9') {",
      "        x = (x << 3) + (x << 1) + (ch ^ 48);",
      "        ch = getchar();",
      "    }",
      "    return x * f;",
      "}",
      "void write(LL x) {",
      "    if (x < 0) putchar('-'), x = -x;",
      "    if (x > 9) write(x / 10);",
      "    putchar(x % 10 + '0');",
      "}"
    ]
  },
  "快读快写2": {
    "prefix": "rw2",
    "description": "快读快写",
    "body": [
      "//快读快写",
      "char buf[1 << 23], *p1 = buf, *p2 = buf;",
      "#define getchar() (p1 == p2 && (p2 = (p1 = buf) + fread(buf, 1, 1 << 21, stdin), p1 == p2) ? EOF : *p1++)",
      "int read() {",
      "    int x = 0, f = 1;",
      "    char ch = getchar();",
      "    while (ch < '0' || ch > '9') {",
      "        if (ch == '-') f = -1;",
      "        ch = getchar();",
      "    }",
      "    while (ch >= '0' && ch <= '9') {",
      "        x = (x << 3) + (x << 1) + (ch ^ 48);",
      "        ch = getchar();",
      "    }",
      "    return x * f;",
      "}",
      "void write(int x) {",
      "    if (x < 0) putchar('-'), x = -x;",
      "    if (x > 9) write(x / 10);",
      "    putchar(x % 10 + '0');",
      "}",
    ]
  },
  "readn": {
    "prefix": "rn",
    "body": "n = read();"
  },
  "readm": {
    "prefix": "rm",
    "body": "m = read();"
  },
  "readnm": {
    "prefix": "rnm",
    "body": "n = read(), m = read();"
  },
  "readx": {
    "prefix": "rx",
    "body": "x = read();"
  },
  "ready": {
    "prefix": "ry",
    "body": "y = read();"
  },
  "readxy": {
    "prefix": "rxy",
    "body": "x = read(), y = read();"
  },
  "reada": {
    "prefix": "ra",
    "body": "a = read();"
  },
  "readb": {
    "prefix": "rb",
    "body": "b = read();"
  },
  "readab": {
    "prefix": "rab",
    "body": "a = read(), b = read();"
  },
  "中国剩余定理": {
    "prefix": "CRT",
    "body": [
      "int n;    // 同余方程个数",
      "int m[N]; // 除数数组",
      "int r[N]; // 余数数组",
      "LL M = 1; // 除数累乘积",
      "LL x, y;  // (x,y)是方程 Mi * x + m[i] * y = 1的一个解，x是Mi关于m[i]的逆元",
      "LL res;   // 最小整数解",
      "// 扩展欧几里得模板",
      "LL exgcd(LL a, LL b, LL &x, LL &y) {",
      "    if (!b) {",
      "        x = 1, y = 0;",
      "        return a;",
      "    }",
      "    LL d = exgcd(b, a % b, y, x);",
      "    y -= a / b * x;",
      "    return d;",
      "}",
      "",
      "// 中国剩余定理模板",
      "void CRT() {",
      "    //  一、预处理",
      "    for (int i = 1; i <= n; i++) {",
      "        cin >> m[i] >> r[i];                // 读入除数数组和余数数组",
      "        r[i] = (r[i] % m[i] + m[i]) % m[i]; // ① 预算余数为正数： r[i]可能为负数，预处理成正数,本题没有这个要求，但考虑到通用模板，加上了这块代码",
      "        M *= m[i];                          // ② 预处理除数连乘积",
      "    }",
      "    // 二、计算",
      "    // 功能: 求 x ≡ r_i mod m_i 方程组的解",
      "    for (int i = 1; i <= n; i++) {",
      "        LL Mi = M / m[i];                // ①除数连乘积除去当前的除数，得到Mi",
      "        exgcd(Mi, m[i], x, y);           // ②扩欧求逆元",
      "        x = (x % m[i] + m[i]) % m[i];    // ③逆元防负数",
      "        res = (res + r[i] * Mi * x) % M; // ④累加res（看公式）",
      "    }",
      "}"
    ]
  },
  "四连通": {
    "prefix": "dx4",
    "description": "四连通",
    "body": [
      "int dx[] = {-1, 0, 1, 0}; //上右下左",
      "int dy[] = {0, 1, 0, -1}; //上右下左",
    ],
  },
  "八连通": {
    "prefix": "dx8",
    "description": "八连通",
    "body": [
      "//8个方向",
      "int dx[] = {0, 0, -1, 1, -1, 1, -1, 1}; //上下左右",
      "int dy[] = {1, -1, 0, 0, 1, 1, -1, -1}; //左下，右下，左上，右上",
      ""
    ]
  },
  "二分": {
    "prefix": "ef",
    "body": [
      "int lower_bound(int q[], int l, int r, int x) {",
      "    while (l < r) {",
      "        int mid = (l + r) >> 1;",
      "        if (q[mid] >= x)",
      "            r = mid;",
      "        else",
      "            l = mid + 1;",
      "    }",
      "    return l;",
      "}",
      "int upper_bound(int q[], int l, int r, int x) {",
      "    while (l < r) {",
      "        int mid = (l + r) >> 1;",
      "        if (q[mid] > x)",
      "            r = mid;",
      "        else",
      "            l = mid + 1;",
      "    }",
      "    return l;",
      "}",
      "",
      ""
    ]
  },
  "lower_bound": {
    "prefix": "ef1",
    "body": [
      "//手写二分模板,左闭右开",
      "int l = 0, r = idx;",
      "int mid = (l + r) >> 1;",
      "if (q[mid] >= x)",
      "    r = mid;",
      "else",
      "    l = mid + 1;",
    ]
  },
  "upper_bound": {
    "prefix": "ef2",
    "body": [
      "//手写二分模板,左闭右开",
      "int l = 0, r = idx;",
      "int mid = (l + r) >> 1;",
      "if (q[mid] > x)",
      "   r = mid;",
      "else",
      "   l = mid + 1;",
    ]
  },
  "扩展欧几里得": {
    "prefix": "exgcd",
    "description": "扩展欧几里得",
    "body": [
      "",
      "//扩展欧几里得",
      "LL exgcd(LL a, LL b, LL &x, LL &y) {",
      "    if (!b) {",
      "        x = 1, y = 0;",
      "        return a;",
      "    }",
      "    LL d = exgcd(b, a % b, y, x);",
      "    y -= a / b * x;",
      "    return d;",
      "}"
    ]
  },
  "斐波那契数列": {
    "prefix": "fib",
    "description": "斐波那契数列",
    "body": [
      "typedef long long LL;",
      "const int N = 21;",
      "LL a[N];",
      "/*",
      "    a[1] = 1;",
      "    a[2] = 2;",
      "    for (int i = 3; i < N; i++)",
      "        a[i] = a[i - 1] + a[i - 2];",
      "    for (int i = 1; i < N; i++)",
      "        printf(\"%lld \", a[i]);",
      " */"
    ]
  },
  "01背包": {
    "prefix": "bb01",
    "description": "01背包",
    "body": [
      "#include<bits/stdc++.h>",
      "",
      "using namespace std;",
      "const int N = 1010;",
      "",
      "int n, m;",
      "int v[N], w[N];",
      "int f[N];",
      "",
      "int main() {",
      "    //物品个数n",
      "    scanf(\"%d%d\",&n,&m);",
      "    //读入体积和重量",
      "    for (int i = 1; i <= n; i++) scanf(\"%d%d\",&v[i],&w[i]);",
      "    //01背包模板",
      "    for (int i = 1; i <= n; i++)",
      "        for (int j = m; j >= v[i]; j--)",
      "            f[j] = max(f[j], f[j - v[i]] + w[i]);",
      "",
      "    cout << f[m] << endl;",
      "    return 0;",
      "}"
    ]
  },
  "二维费用01背包": {
    "prefix": "bb01erwei",
    "body": [
      "#include <bits/stdc++.h>",
      "",
      "using namespace std;",
      "const int N = 1010;",
      "const int M = 110;",
      "int n, V, W;",
      "int v1[N], v2[N], w[N];",
      "int f[N][M][M];",
      "",
      "int main() {",
      "    cin >> n >> V >> W;",
      "    for (int i = 1; i <= n; i++) cin >> v1[i] >> v2[i] >> w[i];",
      "    for (int i = 1; i <= n; i++)",
      "        for (int j = 0; j <= V; j++)",
      "            for (int k = 0; k <= W; k++)",
      "                if (j < v1[i] || k < v2[i])",
      "                    f[i][j][k] = f[i - 1][j][k];",
      "                else",
      "                    f[i][j][k] = max(f[i - 1][j - v1[i]][k - v2[i]] + w[i], f[i - 1][j][k]);",
      "    printf(\"%d\", f[n][V][W]);",
      "    return 0;",
      "}"
    ],
    "description": "二维费用01背包",
  },
  "完全背包": {
    "prefix": "bbwq",
    "description": "完全背包",
    "body": [
      "#include <bits/stdc++.h>",
      "",
      "using namespace std;",
      "",
      "const int N = 1010;",
      "",
      "int n, m;",
      "int v[N];",
      "int w[N];",
      "int f[N];",
      "",
      "// 完全背包问题",
      "int main() {",
      "    scanf(\"%d%d\",&n,&m);",
      "    for (int i = 1; i <= n; i++) scanf(\"%d%d\",&v[i],&w[i]);",
      "",
      "    for (int i = 1; i <= n; i++)",
      "        for (int j = v[i]; j <= m; j++)           //一个一个加上来，求一个最大值",
      "            f[j] = max(f[j], f[j - v[i]] + w[i]);",
      "",
      "    cout << f[m] << endl;",
      "    return 0;",
      "}"
    ]
  },
  "多重背包I": {
    "prefix": "bbdc1",
    "description": "多重背包I",
    "body": [
      "#include <bits/stdc++.h>",
      "",
      "using namespace std;",
      "",
      "//多重背包问题，每件物品的数量是有限制的，不是无穷，也不是只有1个。",
      "// 状态表示  集合，属性",
      "// 状态计算",
      "",
      "const int N = 110;",
      "",
      "int n, m;",
      "int v[N], w[N], s[N];",
      "int f[N];",
      "",
      "int main() {",
      "    scanf(\"%d%d\",&n,&m);",
      "    for (int i = 1; i <= n; i++) cin >> scanf(\"%d%d%d\",&v[i],&w[i],&s[i]);",
      "",
      "    for (int i = 1; i <= n; i++)",
      "        for (int j = m; j >= 0; j--)",
      "            for (int k = 0; k <= s[i] && k * v[i] <= j; k++) //穷举所有可能性，尝试拿到最大的合理值",
      "                f[j] = max(f[j], f[j - v[i] * k] + w[i] * k);",
      "",
      "    cout << f[m] << endl;",
      "    return 0;",
      "}"
    ]
  },
  "多重背包II": {
    "prefix": "bbdc2",
    "description": "多重背包II",
    "body": [
      "#include <bits/stdc++.h>",
      "",
      "using namespace std;",
      "const int N = 12010, M = 2010;",
      "",
      "int n, m;",
      "int v[N], w[N];",
      "int f[M];",
      "",
      "//多重背包的二进制优化",
      "int main() {",
      "    scanf(\"%d%d\",&n,&m);",
      "    int cnt = 0;",
      "    for (int i = 1; i <= n; i++) {",
      "        int a, b, s;",
      "        scanf(\"%d%d%d\",&a,&b,&s);",
      "        //二进制优化,能打包则打包之，1,2,4,8,16,...",
      "        int k = 1;",
      "        while (k <= s) {",
      "            cnt++;",
      "            v[cnt] = a * k;",
      "            w[cnt] = b * k;",
      "            s -= k;",
      "            k *= 2;",
      "        }",
      "        //剩下的",
      "        if (s > 0) {",
      "            cnt++;",
      "            v[cnt] = a * s;",
      "            w[cnt] = b * s;",
      "        }",
      "    }",
      "    n = cnt;//数量减少啦",
      "    //01背包",
      "    for (int i = 1; i <= n; i++)",
      "        for (int j = m; j >= v[i]; j--)",
      "            f[j] = max(f[j], f[j - v[i]] + w[i]);",
      "",
      "    cout << f[m] << endl;",
      "    return 0;",
      "}"
    ]
  },
  "多重背包之单调队列优化": {
    "prefix": "bbdc3",
    "body": [
      "#include <bits/stdc++.h>",
      "",
      "using namespace std;",
      "",
      "const int N = 1010;",
      "const int M = 20010;",
      "int n, m;",
      "int v[N], w[N], s[N];",
      "int f[N][M];",
      "int q[M];",
      "//多重背包之单调队列优化",
      "int main() {",
      "    scanf(\"%d%d\",&n,&m);",
      "    for (int i = 1; i <= n; i++) scanf(\"%d%d%d\",&v[i],&w[i],&s[i]);",
      "",
      "    for (int i = 1; i <= n; i++)",
      "        for (int r = 0; r < v[i]; r++) {",
      "            int hh = 0, tt = -1;",
      "            for (int j = r; j <= m; j += v[i]) {",
      "                while (hh <= tt && j - q[hh] > s[i] * v[i]) hh++;",
      "                while (hh <= tt && f[i - 1][q[tt]] + (j - q[tt]) / v[i] * w[i] <= f[i - 1][j]) tt--;",
      "                q[++tt] = j;",
      "                f[i][j] = f[i - 1][q[hh]] + (j - q[hh]) / v[i] * w[i];",
      "            }",
      "        }",
      "    printf(\"%d\", f[n][m]);",
      "    return 0;",
      "}",
      ""
    ],
    "description": "多重背包之单调队列优化"
  },
  "分组背包": {
    "prefix": "bbfz",
    "description": "分组背包",
    "body": [
      "#include <bits/stdc++.h>",
      "",
      "using namespace std;",
      "const int N = 110;",
      "",
      "int n;       //n类物品",
      "int m;       //背包上限为m",
      "int v[N][N]; //价值",
      "int w[N][N]; //体积",
      "int s[N];    //个数",
      "int f[N];    //dp数组，最大值",
      "",
      "//分组背包",
      "int main() {",
      "    scanf(\"%d%d\",&n,&m);",
      "",
      "    for (int i = 1; i <= n; i++) {//枚举每类物品,比如：水果，蔬菜，肉类...",
      "        scanf(\"%d\",&s[i]);      //此类物品中物品的个数,比如2，可能是苹果、香蕉",
      "        for (int j = 1; j <= s[i]; j++)//读入苹果、香蕉的价值和体积",
      "            scanf(\"%d%d\",&v[i][j],&w[i][j])",
      "    }",
      "",
      "    for (int i = 1; i <= n; i++)        //遍历每类物品",
      "        for (int j = m; j >= 0; j--)    //遍历每个可能的体积",
      "            for (int k = 1; k <= s[i]; k++)//遍历第k个物品",
      "                if (v[i][k] <= j)",
      "                    f[j] = max(f[j], f[j - v[i][k]] + w[i][k]);",
      "",
      "    cout << f[m] << endl;",
      "    return 0;",
      "}"
    ]
  },
  "欧几里得求最大公约数": {
    "prefix": "gcd",
    "description": "欧几里得求最大公约数",
    "body": [
      "//最大公约数，辗转相除法",
      "int gcd(int a, int b) {",
      "   return b ? gcd(b, a % b) : a;",
      "}",
      ""
    ]
  },
  "欧拉筛": {
    "prefix": "ols",
    "description": "欧拉筛",
    "body": [
      "//欧拉筛",
      "const int N = 1e5 + 10;",
      "int primes[N], cnt;     // primes[]存储所有素数",
      "bool st[N];             // st[x]存储x是否被筛掉",
      "void get_primes(int n) {",
      "    for (int i = 2; i <= n; i++) {",
      "        if (!st[i]) primes[cnt++] = i;",
      "        for (int j = 0; primes[j]*i <= n; j++) {",
      "            st[primes[j] * i] = true;",
      "            if (i % primes[j] == 0) break;",
      "        }",
      "    }",
      "}",
      "/*",
      " get_primes(200);",
      "    for (int i = 0; i < cnt; i++)",
      "        if (primes[i] > 100) ",
      "cout << primes[i] << \" \";",
      "*/"
    ]
  },
  "埃拉筛": {
    "prefix": "als",
    "description": "埃拉筛",
    "body": [
      "const int N = 1e5 + 10;",
      "int primes[N], cnt;     // primes[]存储所有素数",
      "bool st[N];             // st[x]存储x是否被筛掉",
      "//埃拉筛",
      "void get_primes(int n) {",
      "    for (int i = 2; i <= n; i++)",
      "        if (!st[i]) {",
      "            primes[cnt++] = i;   //记录素数",
      "            for (int j = 2 * i; j <= n; j += i) //成倍数的标识",
      "                st[j] = true;",
      "        }",
      "}",
      "/*",
      " get_primes(200);",
      "    for (int i = 0; i < cnt; i++)",
      "        if (primes[i] > 100) ",
      "cout << primes[i] << \" \";",
      "*/"
    ]
  },
  "回文数": {
    "prefix": "hws",
    "description": "回文数",
    "body": [
      "//判断回文数",
      "bool isHWS(int num) {",
      "    int t = num, ans = 0;",
      "    while (t) {",
      "        ans = ans * 10 + t % 10;",
      "        t /= 10;",
      "    }",
      "    return ans == num;",
      "}",
      ""
    ]
  },
  "质数": {
    "prefix": "isPrime",
    "description": "质数",
    "body": [
      "//判断一个数是不是质数",
      "bool isPrime(int n) {",
      "    if (n < 2) return false;",
      "    for (int i = 2; i <= n / i; i++)",
      "        if (n % i == 0) return false;",
      "    return true;",
      "}",
      "/*",
      " for (int i = 100; i <= 200; i++)",
      "        if (isPrime(i)) cout << i << \" \";",
      "*/",
      ""
    ]
  },
  "最小公倍数": {
    "prefix": "lcm",
    "description": "最小公倍数",
    "body": [
      "//最小公倍数",
      "int lcm(int a, int b) {",
      "    return a * b / gcd(a, b);",
      "}"
    ]
  },
  "水仙花数": {
    "prefix": "sxh",
    "description": "水仙花数",
    "body": [
      "//是不是水仙花数",
      "bool isSXH(int n) {",
      "    int s = 0, m;",
      "    m = n;",
      "    while (m) {",
      "        int a = m % 10;",
      "        s += a * a * a;",
      "        m /= 10;",
      "    }",
      "    return s == n;",
      "}"
    ]
  },
  "完数": {
    "prefix": "wms",
    "description": "完数",
    "body": [
      "//完数",
      "int isWMS(int n) {",
      "    int s = 0;",
      "    for (int i = 1; i <= n / 2; i++)",
      "        if (n % i == 0) s += i;",
      "",
      "    return s == n ? 1 : 0;",
      "}",
      "/*",
      " 用法:",
      "    for (int i = 1; i <= 1000; i++)",
      "        if (isWMS(i)) cout << i << \" \";",
      "    return 0;",
      "*/"
    ]
  },
  "闰年": {
    "prefix": "runnian",
    "description": "闰年",
    "body": [
      "int months_1[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};",
      "int months_2[13] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};",
      "",
      "bool LeapYear(int year) {",
      "    return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);",
      "}",
      "/*",
      "用法：",
      "int main() {",
      "    int y, m, d, days = 0;",
      "    cin >> y >> m >> d;",
      "    if (LeapYear(y)) {",
      "        for (int i = 1; i <= m - 1; i++)",
      "            days += months_2[i];",
      "        days += d;",
      "    } else {",
      "        for (int i = 1; i <= m - 1; i++)",
      "            days += months_1[i];",
      "        days += d;",
      "    }",
      "    cout << days << endl;",
      "    return 0;",
      "}",
      "*/"
    ]
  },
  "长整数": {
    "description": "长整数",
    "prefix": "ll",
    "body": [
      "typedef long long LL;",
    ]
  },
  "无符号长整数": {
    "description": "无符号长整数",
    "prefix": "ull",
    "body": [
      "typedef unsigned long long ULL;"
    ]
  },
  "INT128": {
    "description": "INT128,NOIP可用，不想打高精度的福音",
    "prefix": "lll",
    "body": [
      "typedef __int128 LLL; ",
    ]
  },
  "快速i0循环": {
    "prefix": "fori0",
    "body": [
      "for (int i = 0; i < $1; i++)"
    ],
    "description": "快速i0循环"
  },
  "快速j0循环": {
    "prefix": "forj0",
    "body": [
      "for (int j = 0; j < $1; j++)"
    ],
    "description": "快速j0循环"
  },
  "快速k0循环": {
    "prefix": "fork0",
    "body": [
      "for (int k = 0; k < $1; k++)",
    ],
    "description": "快速k0循环"
  },
  "快速n0循环": {
    "prefix": "forn0",
    "body": [
      "for (int i = 0; i < n; i++)",
    ],
    "description": "快速n0循环"
  },
  "快速m0循环": {
    "prefix": "form0",
    "body": [
      "for (int i = 0; i < m; i++)"
    ],
    "description": "快速m0循环"
  },
  "快速i1循环": {
    "prefix": "fori1",
    "body": [
      "for (int i = 1; i <= $1; i++)",
    ],
    "description": "快速i1循环"
  },
  "快速j1循环": {
    "prefix": "forj1",
    "body": [
      "for (int j = 1; j <= $1; j++)",
    ],
    "description": "快速j1循环"
  },
  "快速k1循环": {
    "prefix": "fork1",
    "body": [
      "for (int k = 1; k <= $1; k++)",
    ],
    "description": "快速k1循环"
  },
  "快速n1循环": {
    "prefix": "forn1",
    "body": [
      "for (int i = 1; i <= n; i++)",
    ],
    "description": "快速n1循环"
  },
  "快速m1循环": {
    "prefix": "form1",
    "body": [
      "for (int i = 1; i <= m; i++)",
    ],
    "description": "快速m1循环"
  },
  "从文件读入数据": {
    "prefix": "fre",
    "body": [
      "//配置从文本文件读入数据",
      "#ifndef ONLINE_JUDGE",
      "freopen(\"in.txt\",\"r\", stdin);",
      "#endif",
    ],
    "description": "从文件读入数据"
  },
  "记录程序运行时间": {
    "prefix": "sj",
    "body": [
      "//记录开始时间",
      "clock_t begin = clock();",
      "$1",
      "//记录结束时间",
      "clock_t end = clock();",
      "cout << \"Running time:\" << (double)(end - begin) / CLOCKS_PER_SEC * 1000 << \"ms\" << endl;"
    ],
    "description": "记录程序运行时间"
  },
  "整数数对PII带x,y": {
    "description": "整数数对PII",
    "prefix": "piixy",
    "body": [
      "typedef pair<int, int> PII;",
      "#define x first",
      "#define y second",
    ]
  },
  "整数数对PII": {
    "description": "整数数对PII",
    "prefix": "pii",
    "body": [
      "typedef pair<int, int> PII;",
    ]
  },
  "双级数对": {
    "prefix": "piii",
    "body": [
      "#define x first",
      "#define y second",
      "typedef pair<int, pair<int, int>> PIII;",
    ],
    "description": "双级数对"
  },
  "无穷大": {
    "prefix": "inf",
    "body": [
      "const int INF = 0x3f3f3f3f;",
    ],
    "description": "无穷大"
  },
  "万能头文件": {
    "prefix": "stdc",
    "body": [
      "#include <bits/stdc++.h>",
    ],
    "description": "万能头文件"
  },
  "Dijkstra算法": {
    "prefix": "dijkstra",
    "body": [
      "const int N = 10010, M = N * 2;",
      "typedef pair<int, int> PII;",
      "//邻接表",
      "int h[N], e[M], w[M], ne[M], idx;",
      "void add(int a, int b, int c) {",
      "    e[idx] = b, w[idx] = c, ne[idx] = h[a], h[a] = idx++;",
      "}",
      "int d[N];   //最短距离数组",
      "bool st[N]; //是否进过队列",
      "//迪杰斯特拉",
      "void dijkstra(int start) {",
      "    memset(d, 0x3f, sizeof d);                        //初始化距离为无穷大",
      "    memset(st, 0, sizeof st);                         //初始化为未出队列过",
      "    priority_queue<PII, vector<PII>, greater<PII>> q; //小顶堆",
      "    q.push({0,start});                               //出发点入队列",
      "    d[start] = 0;                                     //出发点距离0",
      "    while (q.size()) {",
      "        auto t = q.top();",
      "        q.pop();",
      "        int u = t.second;",
      "        if (st[u]) continue;",
      "        st[u] = true;",
      "        for (int i = h[u]; ~i; i = ne[i]) {",
      "            int j = e[i];",
      "            if (d[j] > d[u] + w[i]) {",
      "                d[j] = d[u] + w[i];",
      "                q.push({d[j], j});",
      "            }",
      "        }",
      "    }",
      "}"
    ],
    "description": "Dijkstra"
  },
  "SPFA算法": {
    "prefix": "spfa",
    "body": [
      "int h[N], e[M], w[M], ne[M], idx;",
      "void add(int a, int b, int c) {",
      "    e[idx] = b, w[idx] = c, ne[idx] = h[a], h[a] = idx++;",
      "}",
      "int dist[N];",
      "bool st[N]; ",
      "",
      "// spfa模板",
      "void spfa(int S) {",
      "    queue<int> q;",
      "    memset(dist, 0x3f, sizeof dist);",
      "    dist[S] = 0;",
      "",
      "    q.push(S); ",
      "    st[S] = true;",
      "",
      "    while (q.size()) {",
      "        int u = q.front();",
      "        q.pop();",
      "        st[u] = false;",
      "        for (int i = h[u]; ~i; i = ne[i]) {",
      "            int j = e[i];",
      "            if (dist[j] > dist[u] + w[i]) {",
      "                dist[j] = dist[u] + w[i];",
      "                if (!st[j]) {",
      "                    st[j] = true;",
      "                    q.push(j);",
      "                }",
      "            }",
      "        }",
      "    }",
      "}"
    ],
    "description": "SPFA算法"
  },
  "SPFA_SLF优化算法": {
    "prefix": "spfa_slf",
    "body": [
      "bool st[N];   //是不是在队列中",
      "int dist[N];     //最短距离数组",
      "int e[M], h[N], idx, w[M], ne[M];",
      "void add(int a, int b, int c) {",
      "    e[idx] = b, ne[idx] = h[a], w[idx] = c, h[a] = idx++;",
      "}",
      "void spfa(int S) {",
      "    deque<int> q; //双端队列",
      "    memset(dist, 0x3f, sizeof dist);",
      "    memset(st, false, sizeof(st));",
      "    st[S] = true;",
      "    q.push_back(S);",
      "    dist[S] = 0;",
      "",
      "    while (q.size()) {",
      "        int t = q.front();",
      "        q.pop_front();",
      "        st[t] = false;",
      "        for (int i = h[t]; ~i; i = ne[i]) {",
      "            int j = e[i];",
      "            if (dist[j] > dist[t] + w[i]) {",
      "                dist[j] = dist[t] + w[i];",
      "                if (!st[j]) {",
      "                    st[j] = true;",
      "                    if (q.size() && dist[q.front()] > dist[j])",
      "                        q.push_front(j);",
      "                    else",
      "                        q.push_back(j);",
      "                }",
      "            }",
      "        }",
      "    }",
      "}"
    ],
    "description": "SPFA优化版本"
  },
  "弗洛伊德求多源最短路": {
    "prefix": "floyd",
    "body": [
      "// Floyd算法模板",
      "for (int k = 0; k < n; k++)",
      "   for (int i = 0; i < n; i++)",
      "       for (int j = 0; j < n; j++)",
      "           d[i][j] = min(d[i][j], d[i][k] + d[k][j]);"
    ],
    "description": "Floyd算法模板"
  },
  "O2优化": {
    "prefix": "o2",
    "body": [
      "#pragma GCC optimize(2) //累了就吸点氧吧~"
    ],
    "description": "开启O2优化"
  },
  "链式前向星": {
    "prefix": "ljb",
    "body": [
      "// 初始化链式前向星",
      "memset(h, -1, sizeof h);",
      "//链式前向星",
      "int e[M], h[N], idx, w[M], ne[M];",
      "void add(int a, int b, int c = 0) {",
      "    e[idx] = b, ne[idx] = h[a], w[idx] = c, h[a] = idx++;",
      "}"
    ],
    "description": "链式前向星"
  },
  "二维一维互转": {
    "prefix": "pos",
    "body": [
      "//二维转一维的办法,坐标从(1,1)开始",
      "int get(int x, int y) {",
      "    return (x - 1) * m + y;",
      "}",
      "//一维转二维的办法,坐标从(1,1)开始",
      "int get(int &x, int &y, int z) {",
      "    x = (z - 1) / m + 1;",
      "    y = (z - 1) % m + 1;",
      "}"
    ]
  },
  "Prim算法": {
    "prefix": "prim",
    "body": [
      "",
      "const int INF = 0x3f3f3f3f;",
      "const int N = 510;",
      "int n, m;    //点和边",
      "int g[N][N]; //稠密图，邻接矩阵",
      "int dist[N]; //这个点到集合的距离",
      "bool st[N];  //是不是已经使用过",
      "int res;     //最小生成树里面边的长度之和",
      "",
      "int prim() {",
      "    cin >> n >> m;",
      "    memset(g, 0x3f, sizeof g);       //初始化图",
      "    memset(dist, 0x3f, sizeof dist); //初始化离集合最短距离",
      "    while (m--) {",
      "        int a, b, c;",
      "        cin >> a >> b >> c;",
      "        g[a][b] = g[b][a] = min(g[a][b], c);",
      "    }",
      "    // prim算法的精髓:每次都要把剩余点和生成树的最小距离重新求出来。",
      "    for (int i = 0; i < n; i++) {",
      "        int t = -1;",
      "        for (int j = 1; j <= n; j++)",
      "            if (!st[j] && (t == -1 || dist[t] > dist[j])) t = j;",
      "        if (i && dist[t] == INF) return INF;",
      "        if (i) res += dist[t];",
      "        for (int j = 1; j <= n; j++) dist[j] = min(dist[j], g[t][j]);",
      "        st[t] = true;",
      "    }",
      "    return res;",
      "}"
    ],
    "description": "Prim算法求最小生成树"
  },
  "Kruskal算法": {
    "prefix": "kruskal",
    "body": [
      "",
      "const int INF = 0x3f3f3f3f;",
      "int n, m; // n条顶点,m条边",
      "int res;  //最小生成树的权值和",
      "int cnt;  //组成最小生成树的结点数",
      "// Kruskal用到的结构体",
      "const int N = 100010, M = N << 1;",
      "struct Edge {",
      "    int a, b, w;",
      "    bool operator<(const Edge &W) const {",
      "        return w < W.w;",
      "    }",
      "} e[M];",
      "//并查集",
      "int p[N];",
      "int find(int x) {",
      "    if (x == p[x]) return x;",
      "    return p[x] = find(p[x]);",
      "}",
      "// Kruskal算法",
      "int kruskal() {",
      "    cin >> n >> m;",
      "    for (int i = 0; i < m; i++) {",
      "        int a, b, w;",
      "        cin >> a >> b >> w;",
      "        e[i] = {a, b, w};",
      "    }",
      "    //按边的权重排序",
      "    sort(e, e + m);",
      "    // 初始化并查集",
      "    for (int i = 1; i <= n; i++) p[i] = i;",
      "    //枚举每条边",
      "    for (int i = 0; i < m; i++) {",
      "        int a = e[i].a, b = e[i].b, w = e[i].w;",
      "        a = find(a), b = find(b);",
      "        if (a != b)",
      "            p[a] = b, res += w, cnt++;",
      "    }",
      "    //如果不连通",
      "    if (cnt < n - 1) return INF;",
      "    return res;",
      "}"
    ],
    "description": "Kruskal算法"
  },
  "最简并查集": {
    "prefix": "bcj",
    "body": [
      "//最简并查集",
      "int p[N];",
      "int find(int x) {",
      "    if (x == p[x]) return x;",
      "    return p[x] = find(p[x]);",
      "}",
      "//合并集合",
      "bool join(int a, int b) {",
      "    if (find(a) == find(b)) return false;",
      "    p[find(a)] = find(b);",
      "    return true;",
      "}",
      "//初始化并查集",
      "void init() {",
      "    for (int i = 0; i < N; i++) p[i] = i;",
      "}"
    ],
    "description": "最简并查集"
  },
  "带权并查集": {
    "prefix": "bcjdq",
    "body": [
      "//带边权更新并查集模板",
      "int find(int x) {",
      "    if (x == p[x]) return x;",
      "    int root = find(p[x]);",
      "    d[x] += d[p[x]];",
      "    return p[x] = root;",
      "}"
    ],
    "description": "带权并查集"
  },
  "无序离散化": {
    "prefix": "lshwx",
    "body": [
      "//无序离散化",
      "unordered_map<int, int> S;",
      "int get(int x) {",
      "    if (S.count(x) == 0) S[x] = ++n; // x映射为第n个数字",
      "    return S[x];",
      "}"
    ],
    "description": "无序离散化"
  },
  "lowbit x异或-x": {
    "body": "#define lowbit(x) (x & -x)",
    "prefix": "lowbit",
    "description": "lowbit 不用解释了吧~"
  },
  "树状数组": {
    "prefix": "szsz",
    "body": [
      "// 树状数组模板",
      "typedef long long LL;",
      "#define lowbit(x) (x & -x)",
      "int c[N];",
      "void add(int x, int d) {",
      "    for (int i = x; i < N; i += lowbit(i)) c[i] += d;",
      "}",
      "LL sum(int x) {",
      "    LL res = 0;",
      "    for (int i = x; i; i -= lowbit(i)) res += c[i];",
      "    return res;",
      "}"
    ]
  },
  "多个树状数组": {
    "prefix": "mszsz",
    "body": [
      "// 树状数组模板",
      "int c1[N], c2[N];",
      "",
      "#define lowbit(x) (x & -x)",
      "typedef long long LL;",
      "",
      "void add(int c[], int x, int d) {",
      "    for (int i = x; i < N; i += lowbit(i)) c[i] += d;",
      "}",
      "",
      "LL sum(int c[], int x) {",
      "    LL res = 0;",
      "    for (int i = x; i; i -= lowbit(i)) res += c[i];",
      "    return res;",
      "}"
    ]
  },
  "线段树区间和": {
    "prefix": "xdsqjh",
    "body": [
      "// 线段树模板",
      "#define int long long",
      "#define ls u << 1",
      "#define rs u << 1 | 1",
      "#define mid ((l + r) >> 1)",
      "struct Node {",
      "    int l, r;",
      "    int sum, add; // 区间总和，累加懒标记",
      "} tr[N << 2];",
      "",
      "// 更新统计信息",
      "void pushup(int u) {",
      "    tr[u].sum = tr[ls].sum + tr[rs].sum;",
      "}",
      "",
      "void pushdown(int u) {",
      "    if (tr[u].add == 0) return;",
      "    tr[ls].add += tr[u].add;",
      "    tr[rs].add += tr[u].add;",
      "    tr[ls].sum += (tr[ls].r - tr[ls].l + 1) * tr[u].add;",
      "    tr[rs].sum += (tr[rs].r - tr[rs].l + 1) * tr[u].add;",
      "    tr[u].add = 0; // 清除懒标记",
      "}",
      "",
      "// 构建",
      "void build(int u, int l, int r) {",
      "    tr[u].l = l, tr[u].r = r; // 标记范围",
      "    if (l == r) {             // 叶子",
      "        cin >> tr[u].sum;     // 区间内只有一个元素l(r),区间和为read(),不需要记录向下的传递tag",
      "        return;",
      "    }",
      "    build(ls, l, mid), build(rs, mid + 1, r); // 左右儿子构建",
      "    pushup(u);                                // 通过左右儿子构建后，向祖先节点反馈统计信息变化",
      "}",
      "",
      "// 区间所有元素加上v",
      "void modify(int u, int L, int R, int v) {",
      "    int l = tr[u].l, r = tr[u].r;",
      "    if (l >= L && r <= R) { // 如果完整被覆盖",
      "        tr[u].sum += (r - l + 1) * v;",
      "        tr[u].add += v;",
      "        return;",
      "    }",
      "    if (l > R || r < L) return;               // 如果没有交集",
      "    pushdown(u);                              // 下传懒标记",
      "    modify(ls, L, R, v), modify(rs, L, R, v); // 修改左，修改右",
      "    pushup(u);                                // 向上汇报统计信息",
      "}",
      "",
      "// 查询",
      "int query(int u, int L, int R) {",
      "    int l = tr[u].l, r = tr[u].r;",
      "    if (l >= L && r <= R) return tr[u].sum;   // 如果完整被覆盖",
      "    if (l > R || r < L) return 0;             // 如果没有交集",
      "    pushdown(u);                              // 下传懒标记",
      "    return query(ls, L, R) + query(rs, L, R); // 查询左+查询右",
      "}",
      "// 构建线段树",
      "// build(1, 1, n);"
    ]
  },
  "动态开点线段树": {
    "prefix": "xdsdtkd",
    "body": [
      "// 动态开点线段树",
      "#define int long long",
      "#define ls tr[u].l",
      "#define rs tr[u].r",
      "#define mid ((l + r) >> 1)",
      "struct Node {",
      "    int l, r;",
      "    int sum, add;",
      "} tr[N << 2];",
      "",
      "int root, idx;",
      "// 根节点编号，初始值是0，通过modify创建，第1个，也就是根root=1",
      "// idx:节点号游标",
      "",
      "// 汇总统计信息",
      "void pushup(int u) {",
      "    tr[u].sum = tr[ls].sum + tr[rs].sum;",
      "}",
      "",
      "void pushdown(int &u, int l, int r) {",
      "    if (tr[u].add == 0) return; // 如果没有累加懒标记，返回",
      "    if (ls == 0) ls = ++idx;    // 左儿子创建",
      "    if (rs == 0) rs = ++idx;    // 右儿子创建",
      "    // 懒标记下传",
      "    tr[ls].sum += tr[u].add * (mid - l + 1); // 区间和增加=懒标记 乘以 区间长度",
      "    tr[rs].sum += tr[u].add * (r - mid);",
      "    tr[ls].add += tr[u].add; // 加法的懒标记可以叠加",
      "    tr[rs].add += tr[u].add;",
      "    // 清除懒标记",
      "    tr[u].add = 0;",
      "}",
      "",
      "// 区间修改",
      "void modify(int &u, int l, int r, int L, int R, int v) {",
      "    if (u == 0) u = ++idx; // 动态开点",
      "",
      "    if (l >= L && r <= R) {           // 如果区间被完整覆盖",
      "        tr[u].add += v;               // 加法的懒标记可以叠加",
      "        tr[u].sum += v * (r - l + 1); // 区间和增加=懒标记 乘以 区间长度",
      "        return;",
      "    }",
      "    if (l > R || r < L) return; // 如果没有交集",
      "",
      "    // 下传懒标记",
      "    pushdown(u, l, r);",
      "    // 分裂",
      "    modify(ls, l, mid, L, R, v), modify(rs, mid + 1, r, L, R, v);",
      "    // 汇总",
      "    pushup(u);",
      "}",
      "",
      "// 区间查询",
      "int query(int u, int l, int r, int L, int R) {",
      "    if (l >= L && r <= R) return tr[u].sum; // 如果完整命中，返回我的全部",
      "    if (l > R || r < L) return 0;           // 如果与我无关,返回0",
      "    pushdown(u, l, r);",
      "    return query(ls, l, mid, L, R) + query(rs, mid + 1, r, L, R);",
      "}"
    ]
  },
  "线段树求最大值模板": {
    "prefix": "xdsmax",
    "body": [
      "//线段树求最大值模板",
      "struct Node {",
      "    int l, r, v; // 区间[l, r]中的最大值v",
      "} tr[N << 2];    // 开4倍空间",
      "",
      "void pushup(int u) {",
      "    tr[u].v = max(tr[u << 1].v, tr[u << 1 | 1].v);",
      "}",
      "",
      "void build(int u, int l, int r) {",
      "    tr[u] = {l, r};",
      "    if (l == r) return;",
      "    int mid = (l + r) >> 1;",
      "    build(u << 1, l, mid), build(u << 1 | 1, mid + 1, r);",
      "}",
      "",
      "int query(int u, int l, int r) {",
      "    if (tr[u].l >= l && tr[u].r <= r) return tr[u].v;",
      "    int mid = (tr[u].l + tr[u].r) >> 1;",
      "    int v = 0;",
      "    if (l <= mid) v = query(u << 1, l, r);",
      "    if (r > mid) v = max(v, query(u << 1 | 1, l, r));",
      "    return v;",
      "}",
      "",
      "void modify(int u, int x, int v) {",
      "    if (tr[u].l == tr[u].r) {",
      "        tr[u].v = v;",
      "        return;",
      "    }",
      "    int mid = (tr[u].l + tr[u].r) >> 1;",
      "    if (x <= mid)",
      "        modify(u << 1, x, v);",
      "    else",
      "        modify(u << 1 | 1, x, v);",
      "    pushup(u);",
      "}"
    ]
  },
  "三个数字取最大值": {
    "prefix": "max",
    "body": [
      "//三个数字取最大值",
      "int max(int a, int b, int c) {",
      "    return max(a, max(b, c));",
      "}"
    ],
    "description": "三个数字取最大值"
  },
  "cin录入n": {
    "prefix": "cinn",
    "body": "cin >> n;",
    "description": "录入n"
  },
  "cin录入m": {
    "prefix": "cinm",
    "body": "cin >> m;",
    "description": "录入m"
  },
  "cin录入k": {
    "prefix": "cink",
    "body": "cin >> k;",
    "description": "录入k"
  },
  "cin录入m1m2n": {
    "prefix": "cinm1m2n",
    "body": "cin >> m1 >> m2;",
    "description": "录入m1m2n"
  },
  "cin录入nm1m2": {
    "prefix": "cinnm1m2",
    "body": "cin >> n >> m1 >> m2;",
    "description": "录入nm1m2"
  },
  "cin录入x": {
    "prefix": "cinx",
    "body": "cin >> x;",
    "description": "录入x"
  },
  "cin录入y": {
    "prefix": "ciny",
    "body": "cin >> y;",
    "description": "录入y"
  },
  "cin录入xy": {
    "prefix": "cinxy",
    "body": "cin >> x >> y;",
    "description": "录入xy"
  },
  "cin录入T": {
    "prefix": "cint",
    "body": "cin >> T;",
    "description": "录入T"
  },
  "cin录入t": {
    "prefix": "cint2",
    "body": "cin >> t;",
    "description": "录入t"
  },
  "cin录入a": {
    "prefix": "cina",
    "body": "cin >> a;",
    "description": "录入a"
  },
  "cin录入a,b": {
    "prefix": "cinab",
    "body": "cin >> a >> b;",
    "description": "录入a,b"
  },
  "cin录入a,b,c": {
    "prefix": "cinabc",
    "body": "cin >> a >> b >> c;",
    "description": "录入a,b,c"
  },
  "cin录入a,b,w": {
    "prefix": "cinabw",
    "body": "cin >> a >> b >> w;",
    "description": "录入a,b,w"
  },
  "cin录入n,m参数": {
    "prefix": "cinnm",
    "body": "cin >> n >> m;",
    "description": "录入2个参数"
  },
  "cin录入p,q参数": {
    "prefix": "cinpq",
    "body": "cin >> p >> q;",
    "description": "录入p,q 2个参数"
  },
  "cin录入p参数": {
    "prefix": "cinp",
    "body": "cin >> p;",
    "description": "录入p参数"
  },
  "cin录入q参数": {
    "prefix": "cinq",
    "body": "cin >> q;",
    "description": "录入q参数"
  },
  "cin录入m,n参数": {
    "prefix": "cinmn",
    "body": "cin >> m >> n;",
    "description": "录入m,n,2个参数"
  },
  "cin录入n,m,k个参数": {
    "prefix": "cinnmk",
    "body": "cin >> n >> m >> k;",
    "description": "录入n,m,k个参数"
  },
  "cin录入n,k个参数": {
    "prefix": "cinnk",
    "body": "cin >> n >> k;",
    "description": "录入n,k个参数"
  },
  "cin录入c": {
    "prefix": "cinc",
    "body": "cin >> c;",
    "description": "录入c"
  },
  "cin录入a[i,j]": {
    "prefix": "cinaij",
    "body": "cin >> a[i][j]",
    "description": "录入a[i][j]"
  },
  "cin录入a[i]": {
    "prefix": "cinai",
    "body": "cin >> a[i];",
    "description": "录入a[i]"
  },
  "cin录入s[i]": {
    "prefix": "cinsi",
    "body": "cin >> s[i];",
    "description": "录入s[i]"
  },
  "cin录入s[i][j]": {
    "prefix": "cinsij",
    "body": "cin >> s[i][j];",
    "description": "录入s[i][j]"
  },
  "cin录入v[i]": {
    "prefix": "cinvi",
    "body": "cin >> v[i];",
    "description": "录入v[i]"
  },
  "cin录入w[i]": {
    "prefix": "cinwi",
    "body": "cin >> w[i];",
    "description": "录入w[i]"
  },
  "cin录入vw[i]": {
    "prefix": "cinvwi",
    "body": "cin >> v[i] >> w[i];",
    "description": "录入vw[i]"
  },
  "cin录入vw": {
    "prefix": "cinvw",
    "body": "cin >> v[i] >> w[i];",
    "description": "录入vw"
  },
  "cin录入vws": {
    "prefix": "cinvws",
    "body": "cin >> v[i] >> w[i] >> s[i]",
    "description": "录入vws"
  },
  "cin录入wv[i]": {
    "prefix": "cinwvi",
    "body": "cin >> w[i] >> v[i]",
    "description": "录入wv[i]"
  },
  "cin录入wvs[i]": {
    "prefix": "cinwvs",
    "body": "cin >> w[i] >> v[i] >> s[i];",
    "description": "录入wvs[i]"
  },
  "cin录入w[i][j]": {
    "prefix": "cinwij",
    "body": "cin >> w[i][j];",
    "description": "录入w[i][j]"
  },
  "cin录入q[i]": {
    "prefix": "cinqi",
    "body": "cin >> q[i];",
    "description": "录入q[i]"
  },
  "cin录入q[i][j]": {
    "prefix": "cinqij",
    "body": "cin >> q[i][j];",
    "description": "录入q[i][j]"
  },
  "cin录入b[i,j]": {
    "prefix": "cinbij",
    "body": "cin",
    "description": "录入b[i][j]"
  },
  "cin录入b[i]": {
    "prefix": "cinbi",
    "body": "cin >> b[i];",
    "description": "录入b[i]"
  },
  "录入n": {
    "prefix": "scn",
    "body": "scanf(\"%d\", &n);",
    "description": "录入n"
  },
  "录入m": {
    "prefix": "scm",
    "body": "scanf(\"%d\", &m);",
    "description": "录入m"
  },
  "录入k": {
    "prefix": "sck",
    "body": "scanf(\"%d\", &k);",
    "description": "录入k"
  },
  "录入m1m2n": {
    "prefix": "scm1m2n",
    "body": "scanf(\"%d %d %d\", &m1, &m2, &n);",
    "description": "录入m1m2n"
  },
  "录入nm1m2": {
    "prefix": "scnm1m2",
    "body": "scanf(\"%d %d %d\", &n, &m1, &m2);",
    "description": "录入nm1m2"
  },
  "录入x": {
    "prefix": "scx",
    "body": "scanf(\"%d\", &x);",
    "description": "录入x"
  },
  "录入y": {
    "prefix": "scy",
    "body": "scanf(\"%d\", &y);",
    "description": "录入y"
  },
  "录入xy": {
    "prefix": "scxy",
    "body": "scanf(\"%d %d\", &x ,&y);",
    "description": "录入xy"
  },
  "录入T": {
    "prefix": "sct",
    "body": "scanf(\"%d\", &T);",
    "description": "录入T"
  },
  "录入t": {
    "prefix": "sct2",
    "body": "scanf(\"%d\", &t);",
    "description": "录入t"
  },
  "录入a": {
    "prefix": "sca",
    "body": "scanf(\"%d\", &a);",
    "description": "录入a"
  },
  "录入a,b": {
    "prefix": "scab",
    "body": "scanf(\"%d %d\", &a, &b);",
    "description": "录入a,b"
  },
  "录入a,b,c": {
    "prefix": "scabc",
    "body": "scanf(\"%d %d %d\", &a, &b, &c);",
    "description": "录入a,b,c"
  },
  "录入a,b,w": {
    "prefix": "scabw",
    "body": "scanf(\"%d %d %d\", &a, &b, &w);",
    "description": "录入a,b,w"
  },
  "录入n,m参数": {
    "prefix": "scnm",
    "body": "scanf(\"%d %d\", &n, &m);",
    "description": "录入2个参数"
  },
  "录入p,q参数": {
    "prefix": "scpq",
    "body": "scanf(\"%d %d\", &p, &q);",
    "description": "录入p,q 2个参数"
  },
  "录入p参数": {
    "prefix": "scp",
    "body": "scanf(\"%d\", &p);",
    "description": "录入p参数"
  },
  "录入q参数": {
    "prefix": "scq",
    "body": "scanf(\"%d\", &q);",
    "description": "录入q参数"
  },
  "录入m,n参数": {
    "prefix": "scmn",
    "body": "scanf(\"%d %d\", &m, &n);",
    "description": "录入m,n,2个参数"
  },
  "录入n,m,k个参数": {
    "prefix": "scnmk",
    "body": "scanf(\"%d %d %d\", &n, &m, &k);",
    "description": "录入n,m,k个参数"
  },
  "录入n,k个参数": {
    "prefix": "scnk",
    "body": "scanf(\"%d %d\", &n, &k);",
    "description": "录入n,k个参数"
  },
  "录入不确定的整数值": {
    "prefix": "sc",
    "body": "scanf(\"%d\", &$1);",
    "description": "录入不确定的整数值"
  },
  "录入不确定的长整数值1": {
    "prefix": "scl",
    "body": "scanf(\"%lld\", &$1);",
    "description": "录入不确定的长整数值1"
  },
  "录入不确定的整数值1": {
    "prefix": "sc1",
    "body": "scanf(\"%d\", &$1);",
    "description": "录入不确定的整数值1"
  },
  "录入不确定的整数值2": {
    "prefix": "sc2",
    "body": "scanf(\"%d %d\", &$1,&$2);",
    "description": "录入不确定的整数值2"
  },
  "录入不确定的整数值3": {
    "prefix": "sc3",
    "body": "scanf(\"%d %d %d\", &$1,&$2,&$3);",
    "description": "录入不确定的整数值3"
  },
  "录入不确定的整数值4": {
    "prefix": "sc4",
    "body": "scanf(\"%d %d %d %d\", &$1,&$2,&$3,&$4);",
    "description": "录入不确定的整数值4"
  },
  "录入不确定的整数值5": {
    "prefix": "sc5",
    "body": "scanf(\"%d %d %d %d %d\", &$1,&$2,&$3,&$4,&$5);",
    "description": "录入不确定的整数值5"
  },
  "录入不确定的整数值6": {
    "prefix": "sc6",
    "body": "scanf(\"%d %d %d %d %d %d\", &$1,&$2,&$3,&$4,&$5,&$6);",
    "description": "录入不确定的整数值6"
  },
  "录入c": {
    "prefix": "scc",
    "body": "scanf(\"%d\", &c);",
    "description": "录入c"
  },
  "录入nLong": {
    "prefix": "scln",
    "body": "scanf(\"%lld\", &n);",
    "description": "录入nLong"
  },
  "录入aLong": {
    "prefix": "scla",
    "body": "scanf(\"%lld\", &a);",
    "description": "录入aLong"
  },
  "录入aLong,bLong": {
    "prefix": "sclab",
    "body": "scanf(\"%lld %lld\", &a, &b);",
    "description": "录入aLong,bLong"
  },
  "录入aLong,bLong,cLong": {
    "prefix": "sclabc",
    "body": "scanf(\"%lld %lld %lld\", &a, &b, &c);",
    "description": "录入aLong,bLong,cLong"
  },
  "录入nLong,mLong参数": {
    "prefix": "sclnm",
    "body": "scanf(\"%lld %lld\", &n, &m);",
    "description": "录入nLong,mLong"
  },
  "录入nLong,mLong,kLong参数": {
    "prefix": "scnlmk",
    "body": "scanf(\"%lld %lld %lld\", &n, &m, &k);",
    "description": "录入nLong,mLong,kLong参数"
  },
  "录入a[i,j]": {
    "prefix": "scaij",
    "body": "scanf(\"%d\", &a[i][j]);",
    "description": "录入a[i][j]"
  },
  "录入a[i]": {
    "prefix": "scai",
    "body": "scanf(\"%d\", &a[i]);",
    "description": "录入a[i]"
  },
  "录入s[i]": {
    "prefix": "scsi",
    "body": "scanf(\"%d\", &s[i]);",
    "description": "录入s[i]"
  },
  "录入s[i][j]": {
    "prefix": "scsij",
    "body": "scanf(\"%d\", &s[i][j]);",
    "description": "录入s[i][j]"
  },
  "录入v[i]": {
    "prefix": "scvi",
    "body": "scanf(\"%d\", &v[i]);",
    "description": "录入v[i]"
  },
  "录入w[i]": {
    "prefix": "scwi",
    "body": "scanf(\"%d\", &w[i]);",
    "description": "录入w[i]"
  },
  "录入vw[i]": {
    "prefix": "scvwi",
    "body": "scanf(\"%d %d\",&v[i], &w[i]);",
    "description": "录入vw[i]"
  },
  "录入vw": {
    "prefix": "scvw",
    "body": "scanf(\"%d %d\",&v, &w);",
    "description": "录入vw"
  },
  "录入vws": {
    "prefix": "scvws",
    "body": "scanf(\"%d %d %d\",&v, &w ,&s);",
    "description": "录入vws"
  },
  "录入wv[i]": {
    "prefix": "scwvi",
    "body": "scanf(\"%d %d\",&w[i], &v[i]);",
    "description": "录入wv[i]"
  },
  "录入wvs[i]": {
    "prefix": "scwvsi",
    "body": "scanf(\"%d %d %d\", &vw[i], &v[i], &s);",
    "description": "录入wvs[i]"
  },
  "录入w[i][j]": {
    "prefix": "scwij",
    "body": "scanf(\"%d\", &w[i][j]);",
    "description": "录入w[i][j]"
  },
  "录入q[i]": {
    "prefix": "scqi",
    "body": "scanf(\"%d\", &q[i]);",
    "description": "录入w[i]"
  },
  "录入q[i][j]": {
    "prefix": "scqij",
    "body": "scanf(\"%d\", &q[i][j]);",
    "description": "录入q[i][j]"
  },
  "录入b[i,j]": {
    "prefix": "scbij",
    "body": "scanf(\"%d\", &b[i][j]);",
    "description": "录入b[i][j]"
  },
  "录入b[i]": {
    "prefix": "scbi",
    "body": "scanf(\"%d\", &b[i]);",
    "description": "录入b[i]"
  },
  "输出数字": {
    "prefix": "pt",
    "body": "printf(\"%d \",$1);",
    "description": "输出数字,不换行"
  },
  "输出1": {
    "prefix": "pn",
    "body": "printf(\"%d\\n\",$1);",
    "description": "输出数字1"
  },
  "输出2": {
    "prefix": "pn2",
    "body": "printf(\"%d %d\\n\",$1,);",
    "description": "输出数字2"
  },
  "输出3": {
    "prefix": "pn3",
    "body": "printf(\"%d %d %d\\n\",$1, ,);",
    "description": "输出数字3"
  },
  "输出Long1": {
    "prefix": "pln",
    "body": "printf(\"%lld\\n\",$1);",
    "description": "输出数字1Long"
  },
  "输出2Long": {
    "prefix": "pl2n",
    "body": "printf(\"%lld %lld\\n\",$1,);",
    "description": "输出数字2Long"
  },
  "输出3Long": {
    "prefix": "pl3n",
    "body": "printf(\"%lld %lld %lld\\n\",$1, ,);",
    "description": "输出数字3Long"
  },
  "输入常量N": {
    "prefix": "conn",
    "body": "const int N = 1010;",
    "description": "输入常量N"
  },
  "Tarjan算法求强连通分量": {
    "prefix": "tarjan",
    "description": "Tarjan算法求强连通分量",
    "body": [
      "// Tarjan算法求强连通分量",
      "int dfn[N], low[N];",
      "int stk[N], top;",
      "bool in_stk[N];",
      "int timestamp;",
      "int scc;",
      "void init_tarjan(int n) {",
      "    timestamp = scc = top = 0;",
      "    memset(in_stk, false, sizeof(in_stk));",
      "    memset(dfn, 0, sizeof(dfn));",
      "}",
      "void tarjan(int u) {",
      "    dfn[u] = low[u] = ++timestamp;",
      "    stk[++top] = u;",
      "    in_stk[u] = true;",
      "    for (int i = h[u]; ~i; i = ne[i]) {",
      "        int j = e[i];",
      "        if (!dfn[j]) {",
      "            tarjan(j);",
      "",
      "            low[u] = min(low[u], low[j]);",
      "        } else if (in_stk[j])",
      "            low[u] = min(low[u], low[j]);",
      "    }",
      "",
      "    if (dfn[u] == low[u]) {",
      "        ++scc;",
      "        int x;",
      "        do {",
      "            x = stk[top--];",
      "            in_stk[x] = false;",
      "        } while (x != u);",
      "    }",
      "}",
      "// 调用示例",
      "// for (int i = 0; i < n; i++)",
      "//     if (!dfn[i]) tarjan(i);"
    ]
  },
  "快速幂":{"prefix":"qmi","body": [
    "// 快速幂",
    "int qmi(int a, int b, int p) {",
    "    int res = 1;",
    "    a %= p;",
    "    while (b) {",
    "        if (b & 1) res = res * a % p;",
    "        b >>= 1;",
    "        a = a * a % p;",
    "    }",
    "    return res;",
    "}",
    ""]},
  "龟速乘": {
    "prefix": "qmul",
    "body": [
      "//龟速乘",
      "int qmul(int a, int b, int p) {",
      "    int res = 0;",
      "    while (b) {",
      "        if (b & 1) res = (res + a) % p;",
      "        a = (a + a) % p;",
      "        b >>= 1;",
      "    }",
      "    return res;",
      "}"
    ],
    "description": "龟速乘"
  },
  "矩阵乘法与快速幂": {
    "prefix": "jzmul",
    "body": [
      "//矩阵乘法",
      "void mul(int a[][N], int b[][N], int c[][N]) {",
      "    int t[N][N] = {0};",
      "    for (int i = 0; i < N; ++i) {",
      "        for (int j = 0; j < N; ++j)",
      "            for (int k = 0; k < N; ++k)",
      "                t[i][j] = (t[i][j] + (LL)(a[i][k] * b[k][j]) % mod) % mod;",
      "    }",
      "    memcpy(c, t, sizeof t);",
      "}",
      "",
      "",
      "/*",
      "// f:base case或者单位矩阵",
      "// a:需要计算快速幂的常数矩阵 ",
      "// f:结果存储",
      "int f[N][N] = {1}; ",
      "//矩阵快速幂",
      "for (int i = n; i; i >>= 1) {",
      "    if (i & 1) mul(f, a, f); // f(3)=f(1)*a(2)",
      "    mul(a, a, a);            // 倍增a",
      "}",
      "*/"
    ],
    "description": "矩阵乘法与快速幂"
  },
  "加快读入": {
    "prefix": "sync",
    "body": [
      "//加快读入",
      "ios::sync_with_stdio(false), cin.tie(0);",
    ],
    "description": "加快读入"
  },
  "加快读入2": {
    "prefix": "sync2",
    "body": [
      "//加快读入",
      "ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);",
    ],
    "description": "加快读入"
  },
  "高斯消元求解线性方程组": {
    "prefix": "gauss",
    "body": [
      "const double eps = 1e-8;",
      "double a[N][N];",
      "",
      "int gauss() {",
      "    int c, r;",
      "    for (c = 0, r = 0; c < n; c++) {",
      "        int t = r;",
      "        for (int i = r; i < n; i++)",
      "            if (abs(a[i][c]) > abs(a[t][c])) t = i;",
      "",
      "        if (abs(a[t][c]) < eps) continue;",
      "",
      "        if (r != t) swap(a[t], a[r]);",
      "",
      "        for (int i = n; i >= c; i--) a[r][i] /= a[r][c];",
      "",
      "        for (int i = r + 1; i < n; i++)",
      "            for (int j = n; j >= c; j--)",
      "                a[i][j] -= a[r][j] * a[i][c];",
      "        r++;",
      "    }",
      "",
      "    if (r < n) {",
      "        for (int i = r; i < n; i++)",
      "            if (abs(a[i][n]) > eps)",
      "                return 2;",
      "        return 1;",
      "    }",
      "",
      "    for (int i = n - 2; i >= 0; i--)",
      "        for (int j = i + 1; j < n; j++)",
      "            a[i][n] -= a[i][j] * a[j][n];",
      "",
      "    return 0;",
      "}",
      "/*",
      "调用示例：",
      "for (int i = 0; i < n; i++)",
      "    for (int j = 0; j <= n; j++)",
      "        cin >> a[i][j];",
      "",
      "int t = gauss();",
      "if (t == 2)",
      "    puts(\"No solution\");",
      "else if (t == 1)",
      "    puts(\"Infinite group solutions\");",
      "else {",
      "    for (int i = 0; i < n; i++) {",
      "        if (abs(a[i][n]) < eps) a[i][n] = 0;",
      "        printf(\"%.2lf\n\", a[i][n]);",
      "    }",
      "}",
      "*/"
    ]
  },
  "高斯消元求解异或线性方程组": {
    "prefix": "gaussxor",
    "body": [
      "int a[N][N];",
      "void gauss() {",
      "    int c, r;",
      "    for (c = 0, r = 0; c < n; c++) {",
      "        int t = r;",
      "",
      "        for (int i = r; i < n; i++)",
      "            if (a[i][c]) {",
      "                t = i;",
      "                break;",
      "            }",
      "",
      "        if (!a[t][c]) continue;",
      "",
      "        if (r != t) swap(a[r], a[t]);",
      "",
      "        for (int i = r + 1; i < n; i++)",
      "            if (a[i][c])",
      "                for (int j = n; j >= c; j--)",
      "                    a[i][j] ^= a[r][j];",
      "",
      "        r++;",
      "    }",
      "    if (r < n) {",
      "        for (int i = r; i < n; i++)",
      "            if (a[i][n]) {",
      "                puts(\"No solution\");",
      "                exit(0);",
      "            }",
      "",
      "        puts(\"Multiple sets of solutions\");",
      "        exit(0);",
      "    }",
      "",
      "    for (int i = n - 2; i >= 0; i--)",
      "        for (int j = i + 1; j < n; j++)",
      "            a[i][n] ^= a[i][j] * a[j][n];",
      "}",
      "/*",
      "调用示例：",
      "cin >> n;",
      "for (int i = 0; i < n; i++)",
      "    for (int j = 0; j < n + 1; j++)",
      "        cin >> a[i][j];",
      "",
      "gauss();",
      "",
      "for (int i = 0; i < n; i++) cout << a[i][n] << endl;",
      "*/"
    ]
  },
  "高精度加法": {
    "prefix": "add",
    "body": [
      "const int N = 100010;",
      "int a[N], b[N];",
      "int al, bl;",
      "void add(int a[], int &al, int b[], int &bl) {",
      "    int t = 0;",
      "    al = max(al, bl);",
      "    for (int i = 1; i <= al; i++) {",
      "        t += a[i] + b[i];",
      "        a[i] = t % 10;",
      "        t /= 10;",
      "    }",
      "    if (t) a[++al] = 1;",
      "}",
      "/*",
      "用法：",
      "for (int i = x.size() - 1; i >= 0; i--) a[++al] = x[i] - '0';",
      "for (int i = y.size() - 1; i >= 0; i--) b[++bl] = y[i] - '0';",
      "",
      "add(a, al, b, bl);",
      "for (int i = al; i; i--) printf(\"%d\", a[i]);",
      "*/"
    ]
  },
  "高精度减法": {
    "prefix": "sub",
    "body": [
      "const int N = 1e5 + 10;",
      "int a[N], al;",
      "int b[N], bl;",
      "void sub(int a[], int &al, int b[], int &bl) {",
      "    int t = 0;",
      "    al = max(al, bl);",
      "    for (int i = 1; i <= al; i++) {",
      "        t = a[i] - b[i] - t;",
      "        a[i] = (t + 10) % 10;",
      "        t < 0 ? t = 1 : t = 0;",
      "    }",
      "    while (al > 1 && a[al] == 0) al--;",
      "}",
      "/*",
      "用法",
      "//负号",
      "if (x.size() < y.size() || (x.size() == y.size() && x < y)) {",
      "    printf(\"-\");",
      "    swap(x, y);",
      "}",
      "",
      "for (int i = x.size() - 1; i >= 0; i--) a[++al] = x[i] - '0';",
      "for (int i = y.size() - 1; i >= 0; i--) b[++bl] = y[i] - '0';",
      "",
      "sub(a, al, b, bl);",
      "for (int i = al; i >= 1; i--) printf(\"%d\", a[i]);",
      "*/"
    ]
  },
  "高精乘低精": {
    "prefix": "mul",
    "body": [
      "const int N = 1e5 + 10;",
      "int a[N], al;",
      "",
      "void mul(int a[], int &al, int b) {",
      "    int t = 0;",
      "    for (int i = 1; i <= al; i++) {",
      "        t += a[i] * b;",
      "        a[i] = t % 10;",
      "        t /= 10;",
      "    }",
      "    while (t) {",
      "        a[++al] = t % 10;",
      "        t /= 10;",
      "    }",
      "    //去前导0",
      "    while (al > 1 && !a[al]) al--;",
      "}",
      "/*",
      "用法",
      "for (int i = x.size() - 1; i >= 0; i--) a[++al] = x[i] - '0';",
      "mul(a, al, y);",
      "",
      "for (int i = al; i; i--) printf(\"%d\", a[i]);",
      "*/"
    ]
  },
  "高精乘高精": {
    "prefix": "mul2",
    "body": [
      "const int N = 1e5 + 10;",
      "int a[N], al;",
      "int b[N], bl;",
      "void mul(int a[], int &al, int b[], int &bl) {",
      "    int t = 0;",
      "    int c[N] = {0};",
      "    for (int i = 1; i <= al; i++)",
      "        for (int j = 1; j <= bl; j++)",
      "            c[i + j - 1] += a[i] * b[j];",
      "    al += bl;",
      "    for (int i = 1; i <= al; i++) {",
      "        t += c[i];",
      "        a[i] = t % 10;",
      "        t /= 10;",
      "    }",
      "    // 前导0",
      "    while (al > 1 && a[al] == 0) al--;",
      "}",
      "/*",
      "用法：",
      "for (int i = x.size() - 1; i >= 0; i--) a[++al] = x[i] - '0';",
      "for (int i = y.size() - 1; i >= 0; i--) b[++bl] = y[i] - '0';",
      "",
      "mul(a, al, b, bl);",
      "for (int i = al; i; i--) printf(\"%d\", a[i]);",
      "*/"
    ]
  },
  "高精度乘高精度限定K个长度":{
    "prefix":"mulK",
    "body": [
      "const int N = 1e5 + 10;",
      "int a[N], al;",
      "int b[N], bl;",
      "void mul(int a[], int &al, int b[], int &bl) {",
      "    int t = 0;",
      "    int c[N] = {0};",
      "    for (int i = 1; i <= al; i++)",
      "        for (int j = 1; j <= bl; j++)",
      "            c[i + j - 1] += a[i] * b[j];",
      "    al += bl;",
      "    al = min(al,K); ",
      "    for (int i = 1; i <= al; i++) {",
      "        t += c[i];",
      "        a[i] = t % 10;",
      "        t /= 10;",
      "    }",
      "    // 前导0",
      "    while (al > 1 && a[al] == 0) al--;",
      "}",
      "/*",
      "用法：",
      "for (int i = x.size() - 1; i >= 0; i--) a[++al] = x[i] - '0';",
      "for (int i = y.size() - 1; i >= 0; i--) b[++bl] = y[i] - '0';",
      "",
      "mul(a, al, b, bl);",
      "for (int i = al; i; i--) printf(\"%d\", a[i]);",
      "*/"
    ]
  },
  "高精除低精": {
    "prefix": "div",
    "body": [
      "const int N = 1e5 + 10;",
      "int a[N], al, r;",
      "void div(int a[], int &al, int b, int &r) {",
      "    r = 0;",
      "    for (int i = al; i >= 1; i--) {",
      "        r = r * 10 + a[i];",
      "        a[i] = r / b;",
      "        r %= b;",
      "    }",
      "    //去前导0",
      "    while (al > 1 && !a[al]) al--;",
      "}",
      "/*",
      "用法：",
      "for (int i = x.size() - 1; i >= 0; i--) a[++al] = x[i] - '0';",
      "",
      "div(a, al, y, r);",
      "for (int i = al; i; i--) printf(\"%d\", a[i]);",
      "*/"
    ]
  },
  "打印调试信息一维": {
    "prefix": "debug1",
    "body": [
      "  puts(\"**********************************************\");",
      "    for (int i = 1; i <= n; i++)",
      "        printf(\"%d \", a[i]);",
      "  puts(\"==============================================\");"
    ]
  },
  "打印调试信息二维": {
    "prefix": "debug2",
    "body": [
      "  puts(\"**********************************************\");",
      "    for (int i = 1; i <= n; i++, puts(\"\"))",
      "        for (int j = 1; j <= n; j++)",
      "            printf(\"%d \", f[i][j]);",
      "    puts(\"==============================================\");"
    ]
  },
  "初始化数组f为0": {
    "prefix": "memf",
    "body": [
      "memset(f, 0, sizeof f);"
    ]
  },
  "初始化数组f为INF": {
    "prefix": "memfinf",
    "body": [
      "memset(f, 0x3f, sizeof f);"
    ]
  },
  "初始化数组a为0": {
    "prefix": "mema",
    "body": [
      "memset(a, 0, sizeof a);"
    ]
  },
  "初始化数组a为INF": {
    "prefix": "memainf",
    "body": [
      "memset(a, 0x3f, sizeof a);"
    ]
  },
  "输入HASH": {
    "prefix": "uii",
    "body": [
      "unordered_map<int, int> primes;"
    ],
    "description": "输入HASH"
  },
  "输入①": {
    "prefix": "n1",
    "body": [
      "①"
    ],
    "description": "输入①"
  },
  "输入②": {
    "prefix": "n2",
    "body": [
      "②"
    ],
    "description": "输入②"
  },
  "输入③": {
    "prefix": "n3",
    "body": [
      "③"
    ],
    "description": "输入③"
  },
  "输入④": {
    "prefix": "n4",
    "body": [
      "④"
    ],
    "description": "输入④"
  },
  "输入⑤": {
    "prefix": "n5",
    "body": [
      "⑤"
    ],
    "description": "输入⑤"
  },
  "输入⑥": {
    "prefix": "n6",
    "body": [
      "⑥"
    ],
    "description": "输入⑥"
  },
  "输入⑦": {
    "prefix": "n7",
    "body": [
      "⑦"
    ],
    "description": "输入⑦"
  },
  "输入⑧": {
    "prefix": "n8",
    "body": [
      "⑧"
    ],
    "description": "输入⑧"
  },
  "输入⑨": {
    "prefix": "n9",
    "body": [
      "⑨"
    ],
    "description": "输入⑨"
  },
  "输入⑩": {
    "prefix": "n10",
    "body": [
      "⑩"
    ],
    "description": "输入⑩"
  },
  "输入1~6": {
    "prefix": "n16",
    "body": [
      "① ② ③ ④ ⑤ ⑥"
    ]
  },
  "fin输入输出": {
    "prefix": "fin",
    "body": [
      "#ifndef ONLINE_JUDGE",
      "   freopen(\"$1.in\", \"r\", stdin);",
      "   freopen(\"$2.out\", \"w\", stdout);",
      "#endif"
    ]
  },
  "while循环": {
    "prefix": "wh",
    "body": "while($1)",
    "description": "while循环"
  },
  "小数精度": {
    "prefix": "eps",
    "body": "const double eps = 1e-8;",
    "description": "小数精度"
  },
  "结构体": {
    "prefix": "node",
    "body": [
      "struct Node {",
      "    int id;",
      "    int value;",
      "    bool operator<(const Node &t) const {",
      "      if (value == t.value) return id < t.id;",
      "      return value < t.value;",
      "    }",
      "} a[N];"
    ]
  },
  "MSI": {
    "prefix": "msi",
    "body": [
      "typedef unordered_map<string, int> MSI;"
    ]
  },
  "MSP": {
    "prefix": "msp",
    "body": [
      "typedef unordered_map<string, pair<char, string>> MSP;"
    ]
  },
  "lrson": {
    "prefix": "lrson",
    "body": [
      "#define ls u << 1",
      "#define rs u << 1 | 1"
    ]
  },
  "数位递增数": {
    "prefix": "DiZengShu",
    "body": [
      "bool iSDiZeng(int x) {",
      "    int p = 10; //哨兵,前驱值",
      "    while (x) {",
      "        if (x % 10 > p) return false; //当前位大于上一数位，则不是数位递增数",
      "        p = x % 10;",
      "        x /= 10;",
      "    }",
      "    return true;",
      "}"
    ]
  },
  "完美数": {
    "prefix": "WMS",
    "body": [
      "int isWMS(int n) {",
      "    int s = 0;",
      "    for (int i = 1; i <= n / 2; i++)",
      "        if (n % i == 0) s += i;",
      "    return s == n;",
      "}"
    ]
  },
  "属于": {
    "prefix": "in",
    "body": [
      "∈"
    ]
  },
  "POJ文件头": {
    "prefix": "POJ",
    "body": [
      "#include <iostream>",
      "#include <algorithm>",
      "#include <queue>",
      "#include <map>",
      "#include <cstring>",
      "#include <vector>",
      "#include <stack>",
      "#include <cstdio>"
    ]
  },
  "离散化": {
    "prefix": "lsh",
    "body": [
      "    // 二分模板 lower_bound (左闭右开)",
      "   int find(int x) {",
      "       return lower_bound(q + 1, q + 1 + ql, x) - q;",
      "     }",
      "// 离散化 = 排序+去重",
      "    sort(q + 1, q + n + 1);",
      "",
      "    // 方法1 【很经典的静态数组原地离散化的套路代码】",
      "    // ql = 1;                                // 第一个元素肯定要保留下来",
      "    // for (int i = 2; i <= n; i++)           // 放过头雁打二雁",
      "    //     if (q[i] != q[ql]) q[++ql] = q[i]; // 如果连续一样的，就放过；如果发现不一样的，就填充入离散化后的数组。在同一个数组上操作，牛X",
      "",
      "    // 方法2 【STL大法去重离散化】",
      "    ql = unique(q + 1, q + 1 + n) - q - 1;",
    ]
  },
  "树状数组求最大值模板": {
    "prefix": "szszMax",
    "body": [
      "// 树状数组求最大值模板",
      "int c[N];",
      "int lowbit(int x) {",
      "    return x & -x;",
      "}",
      "void update(int x, int d) {",
      "    for (int i = x; i < N; i += lowbit(i)) c[i] = max(c[i], d);",
      "}",
      "",
      "int query(int x, int y) {",
      "    int mx = 0;",
      "    while (x <= y) {",
      "        mx = max(mx, a[y]);",
      "        for (--y; y - x >= lowbit(y); y -= lowbit(y)) mx = max(mx, c[y]);",
      "    }",
      "    return mx;",
      "}"
    ]
  },
  "线段树区间边界快速录入": {
    "prefix": "xdsquick",
    "body": [
      "int l = tr[u].l, r = tr[u].r;",
      "if (l > R || r < L) return;",
      "if (l >= L && r <= R) {}"
    ]
  },
  "柯朵莉树模板": {
    "prefix": "odt",
    "body": [
      "// 柯朵莉树模板",
      "struct Node {",
      "    int l, r;      // l和r表示这一段的起点和终点",
      "    mutable int v; // v表示这一段上所有元素相同的值是多少,注意关键字 mutable,使得set中结构体属性可修改",
      "    bool operator<(const Node &b) const {",
      "        return l < b.l; // 规定按照每段的左端点排序",
      "    }",
      "};",
      "set<Node> s; // 柯朵莉树的区间集合",
      "",
      "// 分裂:[l,x-1],[x,r]",
      "set<Node>::iterator split(int x) {",
      "    auto it = s.lower_bound({x});",
      "    if (it != s.end() && it->l == x) return it; // 一击命中",
      "    it--;                                       // 没有找到就减1个继续找",
      "    if (it->r < x) return s.end();              // 真的没找到,返回s.end()",
      "",
      "    int l = it->l, r = it->r, v = it->v; // 没有被返回，说明找到了,记录下来，防止后面删除时被破坏",
      "    s.erase(it);                         // 删除整个区间",
      "    s.insert({l, x - 1, v});             //[l,x-1]拆分",
      "    // insert函数返回pair，其中的first是新插入结点的迭代器",
      "    return s.insert({x, r, v}).first; //[x,r]拆分",
      "}",
      "",
      "// 区间加",
      "void add(int l, int r, int v) {",
      "    // 必须先计算itr,后计算itl",
      "    auto R = split(r + 1), L = split(l);",
      "    for (auto it = L; it != R; it++) it->v += v;",
      "}",
      "// 区间赋值",
      "void assign(int l, int r, int v) {",
      "    auto R = split(r + 1), L = split(l);",
      "    s.erase(L, R);       // 删除旧区间",
      "    s.insert({l, r, v}); // 增加新区间",
      "}",
      "",
      "// 排名第x位的数值",
      "int rnk(int l, int r, int x) {",
      "    vector<PII> v;",
      "    auto R = split(r + 1), L = split(l);",
      "    for (auto it = L; it != R; it++)",
      "        v.push_back({it->v, it->r - it->l + 1}); // 值，个数",
      "    sort(v.begin(), v.end());                    // 默认按PII的第一维，也就是值由小到大排序",
      "",
      "    // 暴力拼接出排名第x大数的数值是多少",
      "    for (auto c : v)",
      "        if (c.second < x)",
      "            x -= c.second;",
      "        else",
      "            return c.first;",
      "}",
      "",
      "// 快速幂 (x^y)%p",
      "// #define int long long",
      "int qmi(int x, int y, int p) {",
      "    int res = 1;",
      "    x %= p;",
      "    while (y) {",
      "        if (y & 1) res = res * x % p;",
      "        y >>= 1;",
      "        x = x * x % p;",
      "    }",
      "    return res;",
      "}",
      "",
      "//[l,r]之间，每个值的x次方，求和，对y取模",
      "int calc(int l, int r, int x, int y) {",
      "    auto R = split(r + 1), L = split(l);",
      "    int res = 0;",
      "    for (auto it = L; it != R; it++)",
      "        // it枚举的是每个区间段，每个区间段内的值是一样的：it->v",
      "        // 区间段的长度 = it->r - it->l + 1",
      "        // 总和 = SUM(区间段的值 * 区间段的长度)",
      "        // 注意一步一取模",
      "        res = (res + qmi(it->v, x, y) * (it->r - it->l + 1) % y) % y;",
      "    return res;",
      "}"
    ]
  },
  "线段树宏": {
    "prefix": "xds_head",
    "body": [
      "#define ls (u << 1)",
      "#define rs (u << 1 | 1)",
      "#define mid ((l + r) >> 1)"
    ]
  },
  "RMQ":{"prefix":"rmq","body": [
    "const int N = 200010, M = 18;",
    "int w[N];",
    "int f[N][M];",
    "// 预处理",
    "void rmq() {",
    "    for (int j = 0; j < M; j++)                     // 注意是j在外层,类似于区间DP,长度在外层",
    "        for (int i = 1; i + (1 << j) - 1 <= n; i++) // i(行)在内层",
    "            if (j == 0)                             // base case 边界值",
    "                f[i][j] = w[i];",
    "            else",
    "                f[i][j] = max(f[i][j - 1], f[i + (1 << j - 1)][j - 1]);",
    "}",
    "",
    "// 查询区间最大值",
    "int query(int l, int r) {",
    "    int len = r - l + 1;",
    "    int k = log2(len);",
    "    return max(f[l][k], f[r - (1 << k) + 1][k]);",
    "}"]}      
}