제출 #1091147

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1091147		nrg_studio	A Huge Tower (CEOI10_tower)	C++17	100 / 100	101 ms	8788 KiB

tower

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

#define ll long long

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

	int mod = 1e9+9;
	int n, d; cin >> n >> d;
	vector<int> a(n); ll ans = 1;
	for (int i=0;i<n;i++) {cin >> a[i];}

	sort(a.begin(),a.end());
	auto it = a.begin();
	while (it!=a.end()) {
		int diff = (it++)-lower_bound(a.begin(),a.end(),*it-d)+1;
		ans = (ans*diff)%mod;
	} cout << ans << '\n';
}

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