View Code of Problem 3686

#include<stdio.h>
#include<stdlib.h>
int compare(const void *a,const void *b){
	return *(int *)a-*(int *)b;
}
int main(){
	int t,n,x,flag,i,j;
	scanf("%d",&t);
	while(t--){
		flag=0;
		scanf("%d %d",&n,&x);
		int a[n];
		for(i=0;i<n;i++)
		scanf("%d",&a[i]);
		qsort(a,n,sizeof(int),compare);
		i=0,j=n-1;
		while(i<j){
			if(a[i]+a[j]==x)
			{
				printf("YES\n");
				flag=1;
				break;
			}
			else if(a[i]+a[j]>x){
				j--;
			}
			else{
				i++;
			}
		}
		if(flag==0)
		printf("NO\n");	
	}
}