View Code of Problem 3686

#include<iostream>
#include<cstring>
using namespace std;
 int t, n, x,i,a[10000000],b[10000000] = { 0 };

int main() {
	
	cin >> t;
	while (t--) {
		//int b[10000000] = { 0 };
		//memset(b, 0, sizeof(b));
		cin >> n >> x;
		for ( i = 0; i < n; i++)
		{
			cin >> a[i];
			b[a[i]]++;
		}
		
		for ( i = 0; i < n; i++) {
			if (b[x - a[i]] != 0&&x!=2*a[i]) {
				cout<<"YES"<<endl;
				break;
			}
			else if (b[x - a[i]] >=2) {
				cout<<"YES"<<endl;
				break;
			}
		}
		if(i==n) cout<<"NO"<<endl;
	}
	return 0;
}