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  1. #include <iostream>
  2. #include<vector>
  3. #include<unordered_map>
  4. using namespace std;
  5.  
  6. int main() {
  7. 	// your code goes here
  8. 	vector<int> arr={1,1,1,2,2,3,3,4};
  9.  
  10. 	unordered_map<int,int> m;
  11. 	for(int i=0;i<arr.size();i++) {
  12. 		m[arr[i]]++;
  13. 	}
  14.  
  15. 	for (auto it = m.begin(); it != m.end(); it++) {
  16.         cout << it->first << " -> " << it->second << endl;
  17.     }
  18. 	return 0;
  19. }
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin 
Standard input is empty
stdout 
4 -> 1
3 -> 2
1 -> 3
2 -> 2
https://ideone.com/goa1k8
language:
C++14 (gcc 8.3)
created:
15 hours ago
visibility:
public

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