제출 #326562

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
326562		shliao	A Huge Tower (CEOI10_tower)	Java	30 / 100	825 ms	50684 KiB

tower

import java.io.*;
import java.util.*;

public class tower {
	static int mod = 1000000009;
	public static void main(String[]args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		StringTokenizer st = new StringTokenizer(br.readLine());
		int N = Integer.parseInt(st.nextToken());
		int D = Integer.parseInt(st.nextToken());
		
		st = new StringTokenizer(br.readLine());
		int[]blocks = new int[N];
		for(int i = 0; i<N; i++) {
			blocks[i] = Integer.parseInt(st.nextToken());
		}
		Arrays.sort(blocks);
		
		int[]stack = new int[N];
		
		int j = N-1;
		for(int i = N-1; i>=0; i--) {
			while(j>=0 && blocks[i]-blocks[j]<=D) j--;
			stack[i] = i-j;
		}
		
		int ans = 1;
		
		for(int i = N-1; i>=0; i--)
		{
			ans = (ans*stack[i]) % mod;
		}
		
		System.out.println(ans);
		
		
		
	}
}

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