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  1. #include <iostream>
  2. #include <vector>
  3. #include <unordered_set>
  4. #include <algorithm>
  5. using namespace std;
  6.  
  7. int main() {
  8. 	vector<int> a {2, 3, 5, 7, 11, 13};
  9. 	vector<int> b {1, 3, 5, 7, 9, 11};
  10. 	unordered_set<int> s(a.begin(), a.end());
  11. 	int res = count_if(b.begin(), b.end(), [&](int k) {return s.find(k) != s.end();});
  12. 	cout << res << endl;
  13. 	return 0;
  14. }
Success #stdin #stdout 0s 3476KB
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https://ideone.com/DZ0TkP
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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