func_code_string: #include <bits/stdc++.h>   using namespace std;   bool debug = false;   int n, m, k;   int dx[4] = {0, 1, 0, -1}, dy[4] = {1, 0, -1, 0};   bool ck(int k) {     double ss = (double)k * m, cnt = 1;     double C = 1, A = k, B = 1;     for (long long lp = 1; cnt < n && ss > 0 && A >= 0; lp++) {       C = C * A / B;       A--;       B++;       double y = min(C, ss / lp);       cnt += y;       ss -= y * lp;     }     return cnt >= n;   }   int main() {     int t;     scanf( %d , &t);     while (t--) {       scanf( %d%d , &n, &m);       int l = 0, r = n;       while (l + 1 < r) {         int mid = (l + r) / 2;         if (ck(mid))           r = mid;         else           l = mid + 1;       }       if (ck(l))         printf( %d n , l);       else         printf( %d n , r);     }     return 0;   }   