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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. char firstRepeating(string &str)
  4. {unordered_set<char> h;
  5. 	for (int i=0; i<str.length(); i++)
  6. 		{char c = str[i];
  7. 		if (h.find(c) != h.end())
  8. 			return c;
  9. 		else 
  10. 			h.insert(c);
  11. 	}
  12. 	return '\0';
  13. }
  14. int main ()
  15. {
  16. 	string str = "geeksforgeeks";
  17. 	cout << firstRepeating(str);
  18. 	return 0;
  19. }
  20.  
Success #stdin #stdout 0s 5440KB
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stdin
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4
datastructures
algorithms
smartinterviews
hackerrank
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e
https://ideone.com/fs97LC
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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