题解 | #判断元素是否出现#

#include<bits/stdc++.h>
using namespace std;
int main() {
    //write your code here......
    int n, m, x, num;
    map<int, int> maps;

    cin >> n >> m;
    for (int i = 0; i < n; i++) {
        cin >> num;
        maps[num]++;
    }

    for (int i = 0; i < m; i++) {
        cin >> x;
        if (maps[x] == 0) {
            cout << "no" << endl;
        } else {
            cout << "yes" << endl;
        }
    }

    return 0;
}