제출 #654077

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
654077		atharvd	A Huge Tower (CEOI10_tower)	C++14	100 / 100	257 ms	2696 KiB

tower

#include<iostream>
#include<algorithm>

#define MOD 1000000009

typedef long long ll;

using namespace std;

int main(){
    int n, d;
    cin >> n >> d;
    int arr[n];
    for(int i = 0; i < n; i++){
        cin >> arr[i];
    }
    sort(arr, arr + n);
    int l = 0;
    int count = 0;
    ll ans = 1;
    for(int r = 0; r < n; r++){
        for(;arr[r] - arr[l] > d; l++){
            count--;
        }
        count++;
        ans *= count;
        ans %= MOD;
    }
    cout << ans << endl;
}

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