제출 #391085

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
391085		yu_lim	A Huge Tower (CEOI10_tower)	Java	100 / 100	719 ms	45380 KiB

tower

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

public class tower {

	public static void main(String[] args) throws IOException {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer str = new StringTokenizer(br.readLine());
		int N = Integer.parseInt(str.nextToken());
		int D = Integer.parseInt(str.nextToken());

		int[] block = new int[N];
		str = new StringTokenizer(br.readLine());
		for (int i = 0; i < N; i++)
			block[i] = Integer.parseInt(str.nextToken());
		br.close();

		Arrays.sort(block);
		long ans = 1; // # ways to make a tower with i blocks
		for (int i = 1, j = 0; i < N; i++) {
			while (j < i && block[j] + D < block[i])
				j++;
			ans = ((i - j + 1) * ans) % (1000000009);
		}
		System.out.println(ans);
	}
}

• Subtask 1: 5 / 5
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• Subtask 20: 5 / 5