fork(1) download 
  1. #include <iostream>
  2. #include <vector>
  3. #include <sstream>
  4. using namespace std;
  5.  
  6. int main() {
  7. 	int n;
  8. 	cin>>n;
  9. 	string s;
  10. 	getline(cin,s);
  11. 	vector<int>a[n+1];
  12. 	for(int i=1; i<=n; i++){
  13. 		getline(cin,s);
  14. 		stringstream potok(s);
  15. 		int x;
  16. 		while(potok>>x){
  17. 			a[x].push_back(i);
  18. 		}
  19. 	}
  20. 	cout<<n<<endl;
  21. 	for(int i=1; i<=n; i++){
  22. 		for(int j:a[i])
  23. 		cout<<j<<" ";
  24. 	cout<<endl;
  25. 	}
  26.  
  27.     return 0;
  28. }
Success #stdin #stdout 0s 5276KB
comments (?)
stdin 
4
2 3
3

2
stdout 
4

1 4 
1 2
https://ideone.com/cCpOa8
language:
C++14 (gcc 8.3)
created:
9 days 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!