python/TangDou/XiTi/1290.cpp

#include <bits/stdc++.h>

using namespace std;

int main() {
    //输入+输出重定向
    freopen("../1290.in", "r", stdin);
    int n;
    cin >> n;
    vector<string> a(n + 1);
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    int x;
    cin >> x;
    switch (x) {
        case 0:
            cout << 0 << endl;
            break;
        case 1:
            for (int i = 1; i <= n; i++) cout << a[i] << endl;
            break;
        case 2:
            for (int i = 1; i <= n; i++) {
                string b = a[i].substr(a[i].size() - 1, 1); //最后一位
                if (b == "0" || b == "2" || b == "4" || b == "6" || b == "8") cout << a[i] << endl;
            }
            break;
        case 3:
            for (int i = 1; i <= n; i++) {
                int sum = 0;
                for (char c:a[i]) {
                    sum += c - '0';
                }
                if (sum % 3 == 0) cout << a[i] << endl;
            }
            break;
        case 4:
            for (int i = 1; i <= n; i++) {
                string lastTwo = a[i].substr(a[i].size() - 2, 2);//最后两个
                //转字符串为数字
                int num = 0;
                istringstream(lastTwo) >> num;
                if (num % 4 == 0)cout << a[i] << endl;
            }
            break;
        case 5:
            for (int i = 1; i <= n; i++) {
                string lastOne = a[i].substr(a[i].size() - 1, 1);//最后一位
                if (lastOne == "0" || lastOne == "5") cout << a[i] << endl;
            }
            break;
        case 6:
            for (int i = 1; i <= n; i++) {
                string b = a[i].substr(a[i].size() - 1, 1);
                if (b == "0" || b == "2" || b == "4" || b == "6" || b == "8") {
                    int sum = 0;
                    for (char c:a[i]) {
                        sum += c - '0';
                    }
                    if (sum % 3 == 0) cout << a[i] << endl;
                }
            }
            break;
        case 7:
            for (int i = 1; i <= n; i++) {
                int k = 0;
                int jishuduan = 0;
                int oushuduan = 0;
                int duancount = 0;
                for (int j = a[i].size() - 1; j >= 0; j--) {
                    k++;
                    if (k == 3) {
                        duancount++;
                        //奇数段
                        if (duancount % 2 == 1) {
                            int num = 0;
                            istringstream(a[i].substr(i, k)) >> num;
                            jishuduan += num;
                        } else { //偶数段
                            int num = 0;
                            istringstream(a[i].substr(i, k)) >> num;
                            oushuduan += num;
                        }
                        k = 0;
                    }
                }

                //如果还有剩余的位数
                if (k > 0) {
                    duancount++;//段数还在增加
                    if (duancount % 2 == 1)//奇数段
                    {
                        int num = 0;
                        istringstream(a[i].substr(i, k)) >> num;
                        jishuduan += num;
                    } else { //偶数段
                        int num = 0;
                        istringstream(a[i].substr(i, k)) >> num;
                        oushuduan += num;
                    }
                }
                //计算绝对值
                if (abs(jishuduan - oushuduan) % 7 == 0)cout << a[i] << endl;
            }
            break;
        case 8:
            for (int i = 1; i <= n; i++) {
                int num = 0;
                if (a[i].size() < 3) {
                    istringstream(a[i]) >> num;
                } else {
                    istringstream(a[i].substr(a[i].size() - 3, 3)) >> num;
                }
                if (num % 8 == 0) cout << a[i] << endl;
            }
            break;
        case 9:
            for (int i = 1; i <= n; i++) {
                int sum = 0;
                for (char c:a[i]) {
                    sum += c - '0';
                }
                if (sum % 9 == 0) cout << a[i] << endl;
            }
            break;
    }
    //关闭文件
    fclose(stdin);
    return 0;
}