이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int mod=1e9+9;
int32_t main()
{
int n,k;cin>>n>>k;
int a[n];
for(int i=0;i<n;i++) cin>>a[i];
sort(a,a+n);
int i=0,j=0,ans=1;
while(i<n){
while(j<n && a[j]-a[i]<=k) j++;
//cout<<j<<" "<<i<<endl;
ans*=(j-i)%mod;
ans%=mod;
i++;
}
cout<<ans<<endl;
return 0;
}
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