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  1. #include <iostream>
  2. #include <set>
  3.  
  4. using namespace std;
  5.  
  6. int main() {
  7. 	set<string> words;
  8. 	string a;
  9.  
  10. 	while (cin >> a) {
  11. 		if (words.count(a)) {
  12. 			cout << a << endl;
  13. 			break;
  14. 		} else {
  15. 			words.insert(a);
  16. 		}
  17. 	}
  18. }
Success #stdin #stdout 0s 3468KB
comments (?)
stdin 
a
b
c
d
b
stdout 
b
https://ideone.com/Mb98YB
language:
C++14 (clang 8.0)
created:
8 years ago
visibility:
public

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