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  1. #include <iostream>
  2. #include <unordered_map>
  3. #include <vector>
  4.  
  5. using namespace std;
  6.  
  7. int main() {
  8. 	vector<int> data({1, 2, 2, 3, 4});
  9. 	unordered_map<int,int> count;
  10. 	vector<int> res(data.size(), 0);
  11. 	for (int i = data.size()-1 ; i >= 0 ; i--) {
  12. 		res[i] = count[data[i]]++;
  13. 	}
  14. 	for (int i = 0 ; i != res.size() ; i++) {
  15. 		cout << data[i] << " - " << res[i] << endl;
  16. 	}
  17. 	return 0;
  18. }
Success #stdin #stdout 0s 5284KB
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stdin
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Standard input is empty
stdout
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1 - 0
2 - 1
2 - 0
3 - 0
4 - 0
https://ideone.com/oXHoWL
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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