View Code of Problem 3686

#include<stdio.h>
#include<string.h>
int a[1000000],b[1000000];
int main(){
	int i,n,x,t,flag;

	scanf("%d",&t);
	while(t--)
	{
		scanf("%d%d",&n,&x);
		memset(b,0,sizeof(b));
		for(i=0;i<n;i++)
		{
			scanf("%d",&a[i]);
			b[a[i]]++;
		}
		for(flag=i=0;i<n;i++)
			if (x!=2*a[i] && b[x-a[i]])
			{
				flag=1;
				break;
			}
			else if (x=2*a[i] && b[x-a[i]]>=2)
			{
				flag=1;
				break;
			}

		if (flag==0)
			printf("NO\n");
		else
			printf("YES\n");
	}

	return 0;
}