제출 #899722

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
899722		ivaziva	A Huge Tower (CEOI10_tower)	C++14	90 / 100	774 ms	2140 KiB

tower

#include <bits/stdc++.h>

using namespace std;

#define MOD 1000000009
#define MAXN 100010

long long n,d;
long long niz[MAXN];

int main()
{
    ios_base::sync_with_stdio(false);
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>d;
    for (long long i=1;i<=n;i++) cin>>niz[i];
    sort(niz+1,niz+n+1);
    long long ans=1;
    for (long long i=2;i<=n;i++)
    {
        long long j=i-1;
        while (j>=1 and niz[i]-niz[j]<=d) j--;
        long long br=i-j;
        ans*=br; if (ans>=MOD) ans%=MOD;
    }
    cout<<ans<<endl;
}

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