1705A - Mark the Photographer - CodeForces Solution

#include<bits/stdc++.h>
using namespace std;
void solve()
{
    int n, i, k, f=0, y;
    cin >> n >> k;
    int x = 2*n;
    vector<int> v, v1, v2;
    for(i=0; i<x; i++)
    {
        cin >> y;
        v.push_back(y);
    }
    sort(v.begin(),v.end());
    for(i=0; i<n; i++)
    {
        if(v[i+n]-v[i]<k)
        {
            f=1;
        }
    }
    if(f==1)
    {
        cout << "NO" << endl;
    }
    else
    {
        cout << "YES" << endl;
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t;
    cin>>t;
    while(t--)
    {
        solve();

    }
    return 0;
}