Submission #391075

#	Time	Username	Problem	Language	Result	Execution time	Memory
391075		yu_lim	A Huge Tower (CEOI10_tower)	Java	30 / 100	716 ms	45532 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_007;

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

		Arrays.sort(blocks);
		long[] towers = new long[N];
		towers[0] = 1;
		int prev = 0;
		for (int i = 0; i < N; i++) {
			while (prev < i) {
				if (blocks[prev] + D < blocks[i])
					prev++;
				else
					break;
			}
			// # of blocks <= i that can't stack on i
			if (i > 0)
				towers[i] = (((i - prev + 1) % M) * towers[i - 1]) % M;
		}
		System.out.println(towers[N - 1] % M);
	}
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 5
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• Subtask 10: 5 / 5
• Subtask 11: 5 / 5
• Subtask 12: 0 / 5
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• Subtask 15: 0 / 5
• Subtask 16: 0 / 5
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• Subtask 19: 0 / 5
• Subtask 20: 0 / 5