semana34.cpp

#include <bits/stdc++.h>
using namespace std;

int main(){

    int n, x;
    cin >> n >> x;

    vector<int> a(n);
    set<int> s;

    for(int i=0; i<n; i++){

        cin >> a[i];
        s.insert(a[i]);
    }

    bool res = false;

    for(int i=0; i<n; i++){

        int outro = a[i] - x;

        if(s.find(outro) != s.end()) res = true;
    }

    if(res) cout << "Yes" << endl;
    else cout << "No" << endl;

    return 0;
}