27 lines
404 B
C++
27 lines
404 B
C++
#include <iostream>
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#include <algorithm>
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using namespace std;
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bool pan(int a,int b){
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return a>b;
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}
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int main()
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{
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int n;
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cin>>n;
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int a[100001]={0};
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for(int i=1;i<=n;i++){
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cin>>a[i];
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}
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sort(a+1,a+1+n,pan);
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int ans=n;
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for(int i=1;i<=n;i++){
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if(i-1>a[i]){
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ans=i-1;
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break;
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}
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}
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cout<<ans;
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}
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