제출 #890728

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
890728		eric_ge	A Huge Tower (CEOI10_tower)	C++17	100 / 100	110 ms	11344 KiB

tower

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

#define F0R(i, a, b) for (int i = (a); i < (b); i++)
#define FOR(i, a) F0R(i, 0, a)

#define f first
#define s second

int cx[] = {0, 1, 0, -1};
int cy[] = {1, 0, -1, 0};

const ll INF = 1e9 + 9;

bool cpr(ll a, ll b)
{
	return {a > b};
}

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

	ll n, diff;
	cin >> n >> diff;

	vector<ll> nums(n);

	FOR(i, n) cin >> nums[i];

	sort(nums.begin(), nums.end(), cpr);

	ll ans = 1;
	ll r = 0;
	ll l = 0;



	while(r != n && l != n)
	{
		while (nums[l] + diff >= nums[r] && l != n)
		{
			ans *= (l - r + 1);
			ans = ans % INF;
			l++;
		}

		r++;
	}

	cout << ans;

	

	return 0;
}

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