C :

#include<stdio.h>
#include<string.h>
unsigned int a[15625010] = {0};
int main()
{
    int i,n,m,x;
    while(~scanf("%d%d",&n,&m))
    {
        memset(a,0,sizeof(a));
        for(i=0; i<n; i++)
        {
            scanf("%d",&x);
            a[ x/32 ] |= 1 << (x%32);
        }
        for(i=0; i<m; i++)
        {
            scanf("%d",&x);
            if( a[x/32] & (1 << (x%32)) )
                printf("Yes\n");
            else
                printf("No\n");
        }

    }
    return 0;
}

C++ :

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<time.h>
#include<cstring>
using namespace std;
#define N 500000000

unsigned a[N/32+5];

int main(){
    //freopen("test.in", "r", stdin);
    //freopen("test.out","w", stdout);
    int d, x, y;
    int n, m;
  
    while( ~scanf("%d%d", &n, &m) ) {
        while(n--) scanf("%d", &d), x = d / 32, y = d % 32, a[x] |= (1<<y);
        while(m--) scanf("%d", &d), x = d / 32, y = d % 32, printf( ( a[x] & (1<<y) ) ? "Yes\n" : "No\n" );
        memset(a, 0, sizeof(a));
    }
    return 0;
}