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;
const int mod = 1e9+9;
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
int n, d;
cin >> n >> d;
vector<int> a(n), ans(n), b(n);
for(int i = 0; i < n; ++i)
cin >> a[i];
sort(begin(a), end(a));
int p = 0;
for(int i = 1; i < n; ++i){
while(a[p] + d < a[i])
++p;
b[i] = i - p;
}
ans[0] = 1;
for(int i = 1; i < n; ++i)
ans[i] = (ans[i-1] * (long long)(b[i]+1)) % mod;
cout << ans.back();
}
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