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  1. #include <iostream>
  2. #include <unordered_set>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int N, M;
  7. 	cin >> N >> M;
  8. 	int dem = 0;
  9. 	unordered_set <int> l1;
  10.  
  11. 	for(int i = 0 ; i < N; i++){
  12. 		int A;
  13. 		cin >> A;
  14. 		l1.insert(A);
  15. 	}
  16.  
  17. 	for(int i = 0 ; i < M ; i++){
  18. 		int B;
  19. 		cin >> B;
  20. 		if(l1.count(B)){
  21. 			dem++;
  22. 		}
  23. 	}
  24. 	cout << dem << endl;
  25.  
  26. }
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
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8 9
7 4 2 8 6 4 2 4
3 7 2 1 2 7 1 4 5
stdout
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5
https://ideone.com/Xe2Z9b
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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