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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n,k;
  6. 	cin>>n>>k;
  7. 	int d=1,s= 0;
  8.     while (d<=k) {
  9.         s+=d*(d+1)/2;
  10.         d++;
  11.     }
  12.     if (s>=n) cout << "YES"<<endl;
  13.     else cout <<"NO"<<endl;
  14.     return 0;
  15. }
Success #stdin #stdout 0.01s 5292KB
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stdin
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19 4
stdout
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YES
https://ideone.com/b1cQtV
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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