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  1. #include <iostream>
  2. #include <string>
  3. #include <set>
  4.  
  5. using namespace std;
  6.  
  7. int main() {
  8. 	string s;
  9. 	cin >> s;
  10. 	char c, k;
  11. 	int last, now=1;
  12. 	set <char> a;
  13. 	for (int i=0; i<s.size(); i++) { //этот код проще по памяти и бытрее работает?
  14. 		last = a.size();
  15. 		now = last;
  16. 		k = s[i];
  17. 		a.insert(k);
  18. 		now = a.size();
  19. 		if (last == now) {
  20. 			c = s[i];
  21. 		}
  22.  
  23. 	}
  24. 	cout << c;
  25. 	return 0;
  26. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/gINTxq
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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