제출 #1276025

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1276025		gg_gong	A Huge Tower (CEOI10_tower)	C++20	100 / 100	65 ms	5228 KiB

tower

#include<bits/stdc++.h>
#define int long long
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
inline int read(){
	int num=0,sign=1;
	char ch=getchar();
	while(ch<'0'||ch>'9'){
		if(ch=='-')
			sign=-sign;
		ch=getchar();
	}
	while(ch>='0'&&ch<='9'){
		num=num*10+(int)ch-48;
		ch=getchar();
	}
	return num*sign;
}
inline void write(int num){
	if(num<0){
		putchar('-');
		num=-num;
	}
	if(num>9)
		write(num/10);
	putchar(num%10+'0');
}
const int MOD=1e9+9;
int n,d;
int ans=1;
int a[1000009];
signed main(){
	n=read(); d=read();
	for(int i=1;i<=n;i++)
		a[i]=read();
	sort(a+1,a+n+1);
	int curl=1;
	for(int curr=1;curr<=n;curr++){
		while(curl<=curr&&a[curl]+d<a[curr])
			curl++;
		ans=ans*(curr-curl+1)%MOD;
	}
	write(ans);
	return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
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• Subtask 20: 5 / 5