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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	long long S;
  6. 	int n=0;
  7.  
  8. 	cin>>S;
  9.  
  10. 	while(S>0){
  11. 		n++;
  12. 		S-=n;
  13. 	}
  14.  
  15. 	if(S<0)
  16. 		n--;
  17.  
  18. 	cout<<n;
  19.  
  20. 	return 0;
  21. }
Success #stdin #stdout 0s 5316KB
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https://ideone.com/F1XZPp
language:
C++ (gcc 8.3)
created:
2 hours ago
visibility:
public

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