제출 #657711

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
657711		sumitvivek_001	A Huge Tower (CEOI10_tower)	C++17	100 / 100	271 ms	8724 KiB

tower

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

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