제출 #866474

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
866474		MisterReaper	A Huge Tower (CEOI10_tower)	C++17	100 / 100	93 ms	8104 KiB

tower

//author: Ahmet Alp Orakci
#include <bits/stdc++.h>
using namespace std;
using i64 = long long;

const int MOD = 1E9 + 9;

#define ONLINE_JUDGE
void solve() {
	int n, d;
	cin >> n >> d;

	int arr[n];
	for(int i = 0; i < n; i++)
		cin >> arr[i];

	sort(arr, arr + n);

	int res = 1, r = 0;
	for(int l = 0; l < n; l++) {
		while(r +1 < n && arr[l] + d >= arr[r +1])
			r++;

		//cerr << l << " " << r << "\n";
		res = (res * 1LL * (r - l +1)) % MOD;
	}

	cout << res;
	
	return;
}

signed main() {
	#ifndef ONLINE_JUDGE
		freopen(".in", "r", stdin);
		freopen(".out", "w", stdout);
	#endif

	ios_base::sync_with_stdio(false);
	cin.tie(NULL); cout.tie(NULL);

	int t = 1; //cin >> t;
	for(int i = 1; i <= t; i++) {
		solve();
	}

	return 0;
}

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