View Code of Problem 3686

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<cmath>
#include<cstring>
#include<vector>
#include<map>
#include<string>
#include<set>
using namespace std;
vector<int>v;
int main(){
    int t;
    cin>>t;
    while(t--)
    {
        int n,x;
        cin>>n>>x;
        for(int i=0;i<n;i++)
        {
            int a;
            cin>>a;
            v.push_back(a);
        }
        sort(v.begin(),v.end());
        int i=0,j=v.size()-1;
        int flag=0;
        while(i<j)
        {
            if(v[i]+v[j]==x)
            {
                flag=1;
                break;
            }
            else if(v[i]+v[j]<x)
                i++;
            else j--;
        }
        if(flag==1)cout<<"YES"<<endl;
        else cout<<"NO"<<endl;
        v.clear();
    }
    return 0;
}