题解 | #判断元素是否出现#

#include<bits/stdc++.h>
#include <iostream>
using namespace std;
int main(){
	//write your code here......
	int n, m;
	cin >> n >> m;
	map<int, int>a;
	for (int i = 0; i < n; ++i)
	{
		int num;
		cin >> num;
		a[num]++;
	}
	int i = 0;
	while (i < m)
	{
		int k;
		cin >> k;
		if (a.count(k))
			cout << "yes" << endl;
		else
		 	cout << "no" << endl;
		++i;
	}
		
	return 0;
}

map使用count区分有没有出现。