View Code of Problem 3686

#include<iostream>
#include<math.h>
#include<string>
#include<algorithm>
using namespace std;
int main(){
	long long t,n,x;
	cin>>t;
	while(t--){
		cin>>n>>x;
		int a[n],flag=0;
		for(int i=0;i<n;i++){
			cin>>a[i];
		}
		sort(a,a+n);
		int l=0,r=n-1;
		while(l<r){
			if(a[l]+a[r]==x){
				cout<<"YES"<<endl;
				flag=1;
				break;
			}
			if(a[l]+a[r]>x){
				r--;
			}
			if(a[l]+a[r]<x){
				l++;
			}
		}
		if(flag==0)cout<<"NO"<<endl;
	}

	return 0;
}