제출 #367192

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
367192		qualia	A Huge Tower (CEOI10_tower)	C++11	100 / 100	142 ms	8820 KiB

tower

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

const long long MOD = 1e9+9;

int main() {
	
	ios_base::sync_with_stdio(false); cin.tie(nullptr);
	
	int N, D;
	cin >> N >> D;
	vector<int> v(N);
	for(int i = 0; i < N; i++) {
		cin >> v[i];
	}
	sort(v.begin(), v.end());
	
	long long ans = 1;
	for(int l = 0, r = 0; l < N; l++) {
		while(r < N && v[r] <= v[l] + D) {
			r++;
		}
		ans = (ans*(r - l)) % MOD;
	}
	cout << ans << '\n';
}

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