제출 #1237860

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1237860		luminescent	A Huge Tower (CEOI10_tower)	C++17	30 / 100	169 ms	5260 KiB

tower

// Source: https://usaco.guide/general/io

#include <bits/stdc++.h>
using namespace std;

int main() {
    long long n, k; cin >> n >> k;
    long long arr[n];
    long long mod = 10e9+9;
    for (long long i =0 ; i< n; i++) {
        cin >> arr[i];
    }
    //
    sort(arr, arr+n);
    //
    long long output = 1;
    long long r = 0;
    for (long long l = 0; l < n; l++) {
        while (r < n-1 && arr[r+1]-arr[l] <= k) {
            r++;
        }
        int diff = r-l+1;
        output = (output*diff*1LL) % mod;
    }
    cout << output;
}

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