func_code_string: #include <bits/stdc++.h>   using namespace std;   const int mod = 1000000007;   const int N = 3020;   const int D = 1001;   int c[N][N], x[N], y[N], b[N], v[N][N], f[N][N], w[N];   int dis(int i, int j) { return max(abs(x[i] - x[j]), abs(y[i] - y[j])); }   int C(int x, int y) { return x >= y ? c[x][y] : 0; }   int main() {     int n, m, r, i, j, u, d, l, ri, ans = 0, tmp;     scanf( %d%d%d , &n, &m, &r);     c[0][0] = 1;     for (i = 1; i <= 2000; i++) {       c[i][0] = 1;       for (j = 1; j <= i; j++) c[i][j] = (c[i - 1][j - 1] + c[i - 1][j]) % mod;     }     for (i = 1; i <= n; i++) {       scanf( %d%d%d , &x[i], &y[i], &b[i]);       x[i] += D, y[i] += D;       v[x[i]][y[i]]++;     }     for (i = 1; i <= 3000; i++)       for (j = 1; j <= 3000; j++)         v[i][j] += v[i - 1][j] + v[i][j - 1] - v[i - 1][j - 1];     for (i = 1; i <= n - 1; i++) {       for (j = i + 1; j <= n; j++) {         u = max(y[i], y[j]) - r;         d = min(y[i], y[j]) + r;         l = max(x[i], x[j]) - r;         ri = min(x[i], x[j]) + r;         if (l <= ri && u <= d)           f[i][j] = v[ri][d] - v[l - 1][d] - v[ri][u - 1] + v[l - 1][u - 1];       }     }     for (i = 1; i <= n; i++) {       for (j = 1; j <= n; j++) {         if (dis(i, j) > r) w[i]++;       }       ans = (ans +              (long long)(C(n, m) - C(w[i], m) + mod) * b[i] % mod * b[i] % mod) %             mod;     }     for (i = 1; i <= n - 1; i++)       for (j = i + 1; j <= n; j++) {         tmp = ((C(w[i], m) + C(w[j], m) -                 C(n - (n - w[i] + n - w[j] - f[i][j]), m)) %                    mod +                mod) %               mod;         ans = (ans +                (long long)(C(n, m) - tmp + mod) * b[j] % mod * b[i] * 2 % mod) %               mod;       }     printf( %d n , ans);     return 0;   }   