func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a, b, n;     cin >> a >> b >> n;     long long l, t, m;     for (int i = 0; i < n; ++i) {       cin >> l >> t >> m;       long long sl = a + b * (l - 1), sr;       if (t < sl) {         cout << -1 << endl;         continue;       }       int lf = l, rt = (t - a) / b + 1;       int r = (lf + rt) / 2;       while (lf != r) {         sr = a + b * (r - 1);         if ((sl + sr) * (r - l + 1) / 2 <= t * m) {           lf = r;         } else {           rt = r - 1;         }         r = (lf + rt) / 2;       }       if ((sl + a + b * (rt - 1)) * (rt - l + 1) / 2 <= t * m) {         r = rt;       }       cout << r << endl;     }     return 0;   }   