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;
    unordered_map<int, int> mp;
    cin>>n>>m;
    for (int i = 0; i < n; i++) {
        cin>>x;
        mp[x]++;
    }
    while (m--) {
        cin>>x;
        if (mp.count(x)) cout<<"yes"<<endl;
        else cout<<"no"<<endl;
    }
	return 0;
}