View Code of Problem 3686

#include<bits/stdc++.h>
using namespace std;
int main(){
	int t;
	cin>>t;
	while(t--){
		int n,x;
		cin>>n>>x;
		int a[n]={0};
		for(int i=0;i<n;i++)
			cin>>a[i];
		sort(a,a+n);
		int p=0,q=n-1,flag=0;
		while(p<q){
			if(a[p]+a[q]==x){
				flag=1;
				break;
			}
			else if(a[p]+a[q]>x){
				q--;
			}
			else if(a[p]+a[q]<x){
				p++;
			}
		}
		if(flag==1)	cout<<"YES"<<endl;
		else cout<<"NO"<<endl;
	}
}