제출 #1078338

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1078338		Kiet07	A Huge Tower (CEOI10_tower)	C++14	100 / 100	91 ms	8876 KiB

tower

#include<bits/stdc++.h>
using namespace std;
int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	int n,d; cin>>n>>d;
	vector<int>a(n);
	for(int i=0;i<n;i++)
	{
		cin>>a[i];
	}
	sort(a.begin(),a.end());
	long long ans=1,mod=1e9+9;
	int l=0;
	for(int r=1;r<n;r++)
	{
		while(a[r]>a[l]+d)
		{
			l++;
		}
		ans=((ans%mod)*((r-l+1)%mod))%mod;
	}
	cout<<ans;
	return 0;
}

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