C++ 代码

#include <iostream>
#include <map>
#include <vector>

using std::cout;
using std::cin;
using std::endl;
using std::map;
using std::vector;

int main()
{
    int n;
    map<int,int> Map;
    int num;
    cin >> n;
    for(int i=0;i<n;i++){
        cin >>num;
        Map[num]++;
    }

    int m;
    vector<int> vec;
    cin >> m;
    for(int i=0;i<m;i++){
        cin >> num;
        vec.push_back(num);
    }

    for(auto elem : vec){
        if(Map[elem] > 0)
            cout << "YES" << endl;
        else 
            cout << "NO" << endl;
    }

    return 0;
}