func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, m;   bool judge(long long k) {     if (n == 1) return 1;     long long num = (long long)m * k, res = 1, C = 1;     for (int i = 1; i <= k; i++) {       if (num < i) return 0;       if ((long long)(k - i + 1) * C >= (long long)n * i)         C = n;       else         C = C * (k - i + 1) / i;       long long temp = min(num / i, C);       res += temp;       if (res >= n) return 1;       num -= temp * i;     }     return 0;   }   int main() {     long long T;     cin >> T;     while (T--) {       cin >> n >> m;       long long l = 0, r = n, mid, ans;       while (l <= r) {         mid = (l + r) / 2;         if (judge(mid)) {           ans = mid;           r = mid - 1;         } else           l = mid + 1;       }       cout << ans << endl;     }   }   