Submission #391084

#	Time	Username	Problem	Language	Result	Execution time	Memory
391084		yu_lim	A Huge Tower (CEOI10_tower)	Java	100 / 100	718 ms	45420 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 M = 1_000_000_009;

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

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
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• Subtask 10: 5 / 5
• Subtask 11: 5 / 5
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• Subtask 15: 5 / 5
• Subtask 16: 5 / 5
• Subtask 17: 5 / 5
• Subtask 18: 5 / 5
• Subtask 19: 5 / 5
• Subtask 20: 5 / 5