fork download
copy 
  1. #include <iostream>
  2. #include <algorithm>
  3. using namespace std;
  4.  
  5. string str,input;
  6. int num;
  7.  
  8. void dfs(int cur){
  9. 	if(str.length()>=num){
  10. 		cout<<str<<"\n";
  11. 		return;
  12. 	}
  13. 	for(int i=cur;i<input.length()-(num-str.length())+1;i++){
  14. 		str+=input[i];
  15. 		dfs(i+1);
  16. 		str.pop_back();
  17. 	}
  18. }
  19.  
  20. int main(){
  21. 	while(!cin.eof()){
  22. 		// take num chars
  23. 		cin>>num;
  24. 		// your string
  25. 		cin>>input;
  26. 		sort(input.begin(),input.end());
  27. 		dfs(0);
  28. 	}
  29. }
Success #stdin #stdout 0.01s 16064KB
comments (?)
stdin
copy 
3
54321
stdout
copy 
123
124
125
134
135
145
234
235
245
345
https://ideone.com/60ZTy5
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!