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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;
  11. }
  12. cout<<d<< endl ;
  13. return 0;
  14. }
Success #stdin #stdout 0s 5320KB
stdin
10
stdout
4