View Code of Problem 3686

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
int main(){
    int t,n,x,a[999],b[999],flag;
    cin>>t;
    while(t--){
        flag=0;
        cin>>n>>x;
        memset(b,0,sizeof(b));
        for(int i=0;i<n;i++){
            cin>>a[i];
            b[a[i]]++;
        }
        for(int i=0;i<n;i++){
            if(x==a[i]*2){
                if(b[x-a[i]]>1){
                    flag=1;
                    break;
                }
            }
            else{
                if(b[x-a[i]]!=0)
                    flag=1;
            }
        }
        if(flag==1)
            cout<<"YES"<<endl;
        else
            cout<<"NO"<<endl;
    }
    return 0;
}