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 MOD 1000000009ll
using namespace std;
using ll = long long;
int main()
{
int num, tol;
cin >> num >> tol;
ll* blocks = new ll[num];
for(int ii = 0; ii < num; ii++)
cin >> blocks[ii];
sort(blocks,blocks+num,greater<>());
int l;
l = 0;
ll* addable = new ll[num];
for(int r = 0; r < num; r++)
{
while(blocks[l]+tol < blocks[r])
l++;
addable[r] = l;
}
ll* ans = new ll[num];
ans[0] = 1;
for(int ii = 1; ii < num; ii++)
{
ans[ii] = ans[ii-1]*addable[ii];
}
cout << ans[num-1] << '\n';
return 0;
}
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