STL

#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll n,x,a[200010];
map<ll,bool>mp;
int main()
{
	scanf("%lld%lld",&n,&x);
	for(ll i=1;i<=n;i++)scanf("%lld",&a[i]),mp[a[i]]=1;
	for(ll i=1;i<=n;i++)if(mp[a[i]-x]){puts("Yes");return 0;}
	puts("No");
	return 0;
}