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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     long long s,sum=1,p=1,n=1;
  6.     cin >> s;
  7.     while (sum<s){ 
  8. 		n++;
  9.         p=p*2+n;
  10.         sum += p;
  11.     }
  12.     cout << n;
  13.     return 0;
  14. }
Success #stdin #stdout 0s 3416KB
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https://ideone.com/APB03h
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language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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