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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int n;
  4. void go(string s,int x){
  5. 	if(x>n) return;
  6. 	string p="1";
  7. 	s+=p;
  8. 	for(int i=0;i<20;i++){
  9. 		go(s,x+1);
  10. 	}	
  11. }
  12. int main(){
  13. 	clock_t t=clock();
  14. 	cin>>n;
  15. 	string s="1";
  16. 	for(int i=0;i<20;i++){
  17. 		go(s,1);
  18. 	}
  19. 	cout<<clock()-t;
  20. }
Success #stdin #stdout 0.51s 15240KB
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https://ideone.com/Sx0xiI
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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