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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. vector <int> a;
  4. int main() {
  5. 	int n;
  6. 	cin >> n;
  7. 	int x;
  8. 	for(int i=0 ; i<n ; i++) {
  9. 		cin >> x;
  10. 		a.push_back(x);
  11. 	}
  12. 	int p;
  13. 	sort(a.begin(),a.end());
  14. 	for(int i=0 ; i<n ; i++) {
  15. 		if(i+1>a[i]){
  16. 			p=i;
  17. 			break;
  18. 		}
  19. 	}
  20. 	cout << p;
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 4384KB
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stdin
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5
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stdout
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3
https://ideone.com/wi2eZq
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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