제출 #480204

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
480204		mohamedsobhi777	A Huge Tower (CEOI10_tower)	C++14	100 / 100	147 ms	8072 KiB

tower

#include <bits/stdc++.h>

using namespace std;

const int N = 2e6 + 7;
const int mod = 1e9 + 9 ; 
int n, d ; 
int a[N] ; 

int main()
{
       ios_base::sync_with_stdio(0);
       cin.tie(0);
#ifndef ONLINE_JUDGE
#endif
       cin >> n >> d ; 
       for(int i = 1 ;i <= n; ++ i){
              cin >> a[i] ; 
       }
       sort(a + 1, a + n + 1) ; 
       int j = 1; 
       int ans = 1 ; 
       for(int i = 1 ;i <= n;++ i){
              while(a[i]-a[j]>d) ++ j; 
              int len = i - j + 1; 
              ans = 1ll * ans * len % mod ; 
       }
       cout << ans ; 
       return 0;
}

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