제출 #858205

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
858205		abeot	A Huge Tower (CEOI10_tower)	C++14	100 / 100	110 ms	8856 KiB

tower

// Source: https://usaco.guide/general/io

#include <bits/stdc++.h>
using namespace std;

const int MOD = 1e9 + 9;

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n; cin >> n;
	int d; cin >> d;
	int a[n];
	for (int i = 0; i < n; ++i) cin >> a[i];
	sort(a, a+n);
	int l = 0;
	long long ans = 1;
	for (int i = 1; i < n; ++i) {
		while (a[i] - a[l] > d) l++;
		int choices = i - l + 1;
		ans = ans * choices;
		ans %= MOD;
	}
	cout << ans << "\n";
}

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