Submission #391079

#	Time	Username	Problem	Language	Result	Execution time	Memory
391079		yu_lim	A Huge Tower (CEOI10_tower)	Java	0 / 100	1106 ms	45284 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[] 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 p = 0; // previous
		for (int i = 0; i < N; i++) {
			while (p < i)
				if (blocks[p] + D < blocks[i])
					p++;
			// # of blocks <= i that can't stack on i
			if (i > 0)
				towers[i] = (((i-p+1)) * towers[i - 1]) % M;
		}
		System.out.println(towers[N - 1] % M);
	}
}

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