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  1. #include <iostream>
  2. #include <unordered_map>
  3.  
  4. using namespace std;
  5.  
  6. int main(void)
  7. {
  8. 	int t;
  9. 	cin>>t;
  10. 	while(t--) {
  11. 		unordered_map<string,string> emap;
  12. 		unordered_map<string,string> rev_emap;
  13. 		int n;
  14. 		cin>>n;
  15. 		while(n--) {
  16. 			string from,to;
  17. 			cin>>from>>to;
  18. 			emap[from]=to;
  19. 			rev_emap[to]=from;
  20. 		}
  21. 		pair<string,string> ref;
  22. 		for(auto const &iter:emap) {
  23. 			if(rev_emap.find(iter.first)==rev_emap.end()) {
  24. 				ref=iter;
  25. 				break;
  26. 			}
  27. 		}
  28. 		cout<<ref.first<<' ';
  29. 		while(emap.find(ref.second)!=emap.end()) {
  30. 			ref=*emap.find(ref.second);
  31. 			cout<<ref.first<<' ';
  32. 		}
  33. 		cout<<ref.second<<' ';
  34. 		cout<<'\n';
  35. 	}
  36. 	return 0;
  37. }
Success #stdin #stdout 0s 15232KB
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stdin
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1
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string ladle
cracker parrot
spoon string
ladle cracker
stdout
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spoon string ladle cracker parrot
https://ideone.com/PqYPx3
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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