제출 #553575

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
553575		1BeeNY1	A Huge Tower (CEOI10_tower)	C++17	90 / 100	48 ms	1392 KiB

tower

#include <bits/stdc++.h>

using namespace std;

int n,d,v[100005];
const int mod=1000000009;

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

    sort(v+1,v+n+1);
    int ways=1,pos=1;

    for(int i=2; i<=n; i++)
    {
        while(pos<i&&v[pos]+d<v[i]) pos++;
        ways=(long long)ways*(i-pos+1)%mod;
    }
    cout<<ways;

    return 0;
}

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