제출 #404567

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
404567		HadiHosseini	A Huge Tower (CEOI10_tower)	C++14	100 / 100	140 ms	11204 KiB

tower

#include <bits/stdc++.h>

using namespace std;

long long mod = 1e9 + 9;

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);

	int n, d; cin >> n >> d;
	vector<long long> v(n);
	for(int i = 0 ; i < n; i++) cin >> v[i];
	sort(v.begin(), v.end());

	long long ans = 1;
	int j = 0;
	for(int i = 0 ; i < n; i++){
		while(v[i] > v[j] + d) j++;
		ans *= (i - j + 1);
		ans %= mod;
	}

	cout << ans << "\n";

	return 0;
}

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