python/TangDou/AcWing/Math/201_4.cpp

#include <iostream>
using namespace std;
typedef long long LL;

//最大公约数，辗转相除法
int gcd(int a, int b) {
    return b ? gcd(b, a % b) : a;
}

//快读
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;
}
const int N = 2010;
int n, m, a[N][N];

void init() {
    for (int i = 1; i <= 1000; i++) //互质，赋值为1
        for (int j = 1; j <= 1000; j++)
            if (gcd(i, j) == 1) a[i][j] = 1;

    for (int i = 1; i <= 1000; i++) //二维前缀和
        for (int j = 1; j <= 1000; j++)
            a[i][j] += a[i - 1][j] + a[i][j - 1] - a[i - 1][j - 1];
}

int main() {
    init();
    int m = read();
    for (int i = 1; i <= m; i++) {
        n = read();
        printf("%d %d %d\n", i, n, a[n][n] + 2); //加上(1,0),(0,1)两个点
    }
    return 0;
}