hash --C++

#include <cstdio>
#include <vector>
#define maxn 100007

using namespace std;

vector<int> a[maxn];

int main()
{
    int n,m;
    scanf("%d%d",&n,&m);
    for (int i = 0; i<n; i++)
    {
        int x;
        scanf("%d",&x);
        a[x % maxn].push_back(x);
    }
    
    for (int i = 0; i<m; i++)
    {
        int x;
        scanf("%d",&x);
        int b = 1,k = a[x % maxn].size();
        for (int j = 0; j<k; i++)
            if (a[x % maxn][j] == x)
            {
                b = 0;
                printf("YES\n");
                break;
            }
        if (b) printf("NO\n");
        
    } 
}