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- #include<iostream>
- #include<algorithm>
- using namespace std;
- int main(){
- int n; cin >> n;
- int a[n];
- for(int i = 0; i < n; i++){
- cin >> a[i];
- }
- sort(a, a+n);
- int ans = 0;
- for(int i = 0; i < n; i++){
- if(a[i] >= ans + 1) ans++;
- }
- //ans--;
- cout << ans;
- }
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