func_code_string: #include <bits/stdc++.h>   using namespace std;   int dis(int x, int y) { return (x * x + y * y); }   int main() {     int d, n, i, x, y, r, cnt = 0, R1, R2;     cin >> r >> d;     R1 = r;     R2 = r - d;     cin >> n;     while (n--) {       cin >> x >> y >> r;       d = dis(x, y);       if (d <= ((R1 - r) * (R1 - r)) && d >= ((R2 + r) * (R2 + r))) {         cnt++;       }     }     cout << cnt << endl;     return 0;   }   