제출 #208407

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
208407		amoo_safar	A Huge Tower (CEOI10_tower)	C++14	100 / 100	178 ms	8184 KiB

tower

#include <bits/stdc++.h>

#define pb push_back
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " : " << x << '\n'

using namespace std;

typedef long long ll;
typedef long double ld;
typedef string str;
typedef pair<ll, ll> pll;

const ll Mod = 1000000009LL;
const int N = 1e6 + 10;
const ll Inf = 2242545357980376863LL;
const ll Log = 30;

int a[N];

int main(){
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	int n, d;
	cin >> n >> d;
	for(int i = 0; i < n; i++) cin >> a[i];
	sort(a, a + n);
	ll ans = 1;
	for(int i = 0; i < n; i++){
		ans = (ans * (i + 1 - (lower_bound(a, a + n, a[i] - d) - a) )) % Mod;
	}
	cout << ans << '\n';
	return 0;
}

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