제출 #535147

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
535147		andecaandeci	A Huge Tower (CEOI10_tower)	C++17	100 / 100	299 ms	8744 KiB

tower

#include <bits/stdc++.h>
using namespace std;
const int MOD = 1e9 + 9;
int main(){
    int n,d;
    cin >> n >> d;
    int arr[n+5];
    for(int i=0;i<n;i++){
        cin >> arr[i];
    }
    sort(arr,arr+n);
    int r = 0, sol = 1;
  for (int l = 0; l < n; l++) {
    while (r < n - 1 && arr[r + 1] - arr[l] <= d) r++;
    int dist = r - l + 1; 
    sol = (sol * 1LL * dist) % MOD;
  }
  cout << sol << '\n';
    return 0;
}

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