题解 C++ map
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https://www.nowcoder.com/practice/d93db01c2ee44e8a9237d63842aca8aa
#include <bits/stdc++.h>
using namespace std;
int main(){
int n,m,x;
map<int,int> mp;
while(cin>>n){
for(int i=0;i<n;i++){
cin>>x;
mp[x]++;
}
cin>>m;
for(int i=0;i<m;i++){
cin>>x;
if(mp[x]>0) cout<<"YES"<<endl;
else cout<<"NO"<<endl;
}
}
return 0;
}
