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  1. #include <iostream>
  2. #include <unordered_map>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	unordered_map<int, int> mp;
  7. 	mp[1]++;
  8. 	cout << mp.size() << endl;
  9. 	mp[1]--;
  10. 	if (mp[1] == 0) {
  11. 		mp.erase(1);
  12. 	}
  13. 	cout << mp.size() << endl;
  14. 	// your code goes here
  15. 	return 0;
  16. }
Success #stdin #stdout 0s 4336KB
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https://ideone.com/pZ8uli
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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