제출 #1103108

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1103108		zephyrion	A Huge Tower (CEOI10_tower)	C++17	30 / 100	85 ms	6780 KiB

tower

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int mod = 1e9 + 9;
const int max_n = 1e7;
int n, d, arr[max_n], res = 1;
signed main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);
	cin >> n >> d;
	for (int i = 0; i < n; i++) {
		cin >> arr[i];
	}
	int res = 1;
	sort(arr, arr + n);
	for (int l = 0, r = 0; l < n; l++){
	    for (; r < n && arr[r] - arr[l] <= d; r++){
            res *= (r - l + 1) % mod;
        }
	}
    cout << res << endl;
	return 0;
}

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