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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     long long n, m, left, right, mid, power, root, i;
  6.     bool tooBig;
  7.  
  8.     cin >> n >> m;
  9.  
  10.     if(m == 0) { cout << 0 << endl; return 0; }
  11.     if(n == 1) { cout << m << endl; return 0; }
  12.  
  13.     left = 1;
  14.     right = m;
  15.     root = -1;
  16.  
  17.     while(left <= right) {
  18.         mid = (left + right) / 2;
  19.         power = 1;
  20.         tooBig = false;
  21.  
  22.         for(i = 0; i < n; i++) {
  23.             if(power > m / mid) { 
  24.                 tooBig = true; 
  25.                 break; 
  26.             }
  27.             power *= mid;
  28.         }
  29.  
  30.         if(!tooBig && power == m) {
  31.             root = mid;
  32.             break;
  33.         } 
  34.         else if(!tooBig && power < m) {
  35.             left = mid + 1;
  36.         } 
  37.         else {
  38.             right = mid - 1;
  39.         }
  40.     }
  41.  
  42.     cout << root << endl;
  43.     return 0;
  44. }
  45.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/T6LQkP
language:
C++ (gcc 8.3)
created:
2 hours ago
visibility:
public

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