제출 #669156

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
669156		Charizard2021	A Huge Tower (CEOI10_tower)	C++17	100 / 100	264 ms	11196 KiB

tower

#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1e9 + 9;
int main () {
	long long n, d;
	cin >> n >> d;
	vector<long long> arr(n);
	for (int i = 0; i < n; i++) {
		cin >> arr[i];
	}
	sort(arr.begin(), arr.end());
	long long r = 0;
	long long ans = 1;
	for(long long l = 0; l < n; l++){
	    while(r < n - 1 && arr[r + 1] - arr[l] <= d){
	        r++;
	    }
	    long long distance = r - l + 1;
	    ans = (ans * distance) % MOD;
	}
	cout << ans << '\n';
}

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