This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define DIM 2000000
#define MOD 1000000009
using namespace std;
int v[DIM];
int n,d,i,j;
int main (){
//ifstream cin ("date.in");
//ofstream cout ("date.out");
cin>>n>>d;
for (i=1;i<=n;i++)
cin>>v[i];
sort (v+1,v+n+1);
long long sol = 1;
for (i=j=1;i<=n;i++){
while (j <= n && v[j] + d < v[i])
j++;
sol = sol * (i-j+1) % MOD;
}
cout<<sol;
return 0;
}
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