제출 #856863

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
856863		Euclid73	A Huge Tower (CEOI10_tower)	C++17	30 / 100	195 ms	7692 KiB

tower

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

const int MOD=1e9+9;

int main()
{
    int n, d;
    cin >> n >> d;
    int a[n];
    for (int i=0; i<n; i++)
    {
        cin >> a[i];
    }
    sort(a, a+n);
    int r=0, ans=1;
    for (int i=0; i<n; i++)
    {
        while (r+1<n && a[r+1]<=a[i]+d)
        {
            r++;
        }
        ans=ans*(r-i+1);
        ans=ans%MOD;
    }
    cout << ans << "\n";
}

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