题解 | #判断元素是否出现#

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

	map<int,int>maps;
	for(int i = 0 ; i < n; i++ ){
		int key;
		cin >> key;
		maps[key] = 1;
	}

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

	







	return 0;
}