제출 #497203

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
497203		MatBad	A Huge Tower (CEOI10_tower)	C++14	95 / 100	130 ms	11180 KiB

tower

#include<bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define FORR(i,a,b) for(int i=a;i>=b;i--)
#define debug(x) cerr<<#x<<" : "<<x<<'\n'
typedef long long ll;
typedef long double ld;
typedef pair<ll , ll> pii;
typedef pair<ll , pii> piii;

const ll MX=1e6+5,  MOD=1e9+9, inf = 1e9+5;
ll n, a[MX], d;



int main(){
    ios::sync_with_stdio(false);cin.tie(NULL);
	cin>>n>>d;
	FOR(i, 1, n) cin>>a[i];
	sort(a+1, a+n+1);
	ll ans=1;
	int it=0;
	FOR(i, 2, n){
		while(a[it]+d<a[i]) it++;
		ans = (ans*(i-it+1))%MOD;
	}
	cout<<ans<<'\n';
	
}

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