제출 #391637

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
391637		nicolaalexandra	A Huge Tower (CEOI10_tower)	C++14	100 / 100	303 ms	8752 KiB

tower

#include <bits/stdc++.h>
#define DIM 2000000
#define MOD 1000000009
using namespace std;

int v[DIM];
int n,d,i,j;

int main (){

    //ifstream cin ("date.in");
    //ofstream cout ("date.out");

    cin>>n>>d;
    for (i=1;i<=n;i++)
        cin>>v[i];

    sort (v+1,v+n+1);

    long long sol = 1;
    for (i=j=1;i<=n;i++){
        while (j <= n && v[j] + d < v[i])
            j++;
        sol = sol * (i-j+1) % MOD;
    }

    cout<<sol;

    return 0;
}

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