제출 #761062

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
761062		lukehsiao	A Huge Tower (CEOI10_tower)	C++14	100 / 100	96 ms	8764 KiB

tower

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

const int MOD = 1000000009;

int n, D;

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

	cin >> n >> D;
	vector<int> sz(n);
	for (int &x : sz)
		cin >> x;
	
	sort(sz.begin(), sz.end());

	ll ans = 1;
	int l = 0;
	for (int r=1; r<n; ++r) {
		while (sz[l] < sz[r]-D)
			++l;
		int spots = r-l;
		ans = ans * (spots+1) % MOD;
	}

	cout << ans << '\n';
}

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