제출 #722600

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
722600		ymm	A Huge Tower (CEOI10_tower)	C++17	100 / 100	162 ms	8744 KiB

tower

#include <bits/stdc++.h>
#define Loop(x,l,r) for (ll x = (l); x < (ll)(r); ++x)
#define LoopR(x,l,r) for (ll x = (r)-1; x >= (ll)(l); --x)
typedef long long ll;
typedef std::pair<int, int> pii;
typedef std::pair<ll , ll > pll;
using namespace std;

int main()
{
	cin.tie(0) -> sync_with_stdio(false);
	int n, d;
	cin >> n >> d;
	vector<int> a(n);
	for (int &x : a)
		cin >> x;
	sort(a.begin(), a.end());
	ll ans = 1;
	const int mod = 1e9+9;
	Loop (i,0,n) {
		int j = lower_bound(a.begin(), a.end(), a[i]-d) - a.begin();
		ans *= i-j+1;
		ans %= mod;
	}
	cout << ans << '\n';
}

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