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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. const int MAX_LENGTH  = 1000;
  5. const int MAX_VAL = 100000;
  6. int freq[MAX_VAL + MAX_VAL + 1];
  7.  
  8.  
  9. int main() {
  10. 	int n,val;
  11. 	cin >> n;
  12. 	for (int i = 1; i <= n; ++i) {
  13. 		cin >> val;
  14. 		int index = val + MAX_VAL;
  15. 		if (freq[index] == 1) {
  16. 			cout << val;
  17. 			return 0;
  18. 		}
  19. 		freq[index] = 1;
  20.  
  21. 	}
  22. 	cout << "NU";
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 5316KB
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https://ideone.com/dV4l3P
language:
C++14 (gcc 8.3)
created:
1 hour ago
visibility:
public

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