제출 #713681

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
713681		hex	A Huge Tower (CEOI10_tower)	Java	100 / 100	651 ms	50872 KiB

tower

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

public class tower {
	static final long MOD = (long) (1e9 + 9);

	public static void main (String[] args) throws IOException {
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		PrintWriter out = new PrintWriter(System.out);
		StringTokenizer st = new StringTokenizer(reader.readLine());
		int N = Integer.parseInt(st.nextToken());
		int diff = Integer.parseInt(st.nextToken());
		int[] sizes = new int[N];
		st = new StringTokenizer(reader.readLine());
		for (int n = 0; n < N; n++) {
			sizes[n] = Integer.parseInt(st.nextToken());
		}
		Arrays.sort(sizes);
		
		int lt = 0;
		int rt = 0;
		long len;
		long ans = 1;
		while (lt < N) {
			while (rt < N - 1 && sizes[rt + 1] <= sizes[lt] + diff) rt++;
			len = rt - lt + 1;
			ans = (ans * len) % MOD;
			lt++;
		}
		out.println(ans);
		out.close();
	}
}

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