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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	long long n;
  6.     cin >> n;
  7.     long long d=0, s=0;
  8.     while (s<n) {
  9.         d++;
  10.        s+=d*(d+1)/2;
  11.     }
  12.     cout << d<<endl;
  13.     return 0;
  14. }
Success #stdin #stdout 0s 5316KB
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https://ideone.com/mrq29A
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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