제출 #345375

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
345375		leu_naut	A Huge Tower (CEOI10_tower)	C++11	100 / 100	451 ms	10732 KiB

tower

#include<bits/stdc++.h>
#define ll long long
using namespace std;
const ll maxn=1e6+1,MOD=1e9+9;
ll h[maxn];
int main()
{
   ll n,d;
   cin>>n>>d;
   ll ans=1;
   for (ll i=1;i<=n;i++) cin>>h[i];
   sort(h+1,h+1+n);
   for (ll i=1;i<=n;i++)
   {
       ll pos=upper_bound(h+1,h+1+n,h[i]-d-1)-h;
//cerr<<pos<<" ";
       if (h[pos]>=h[i]-d) pos=i-pos+1;
       else pos=1;
       //cerr<<pos<<endl;
       //pos++;
       ans*=pos;
       ans%=MOD;
   }
   cout<<ans;
}

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