제출 #525461

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
525461		anjroo	A Huge Tower (CEOI10_tower)	Java	30 / 100	685 ms	51948 KiB

tower

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

public class tower {
	static final int MOD = (int)1e9 + 7;
	static Kattio io = new Kattio();
	
	public static void main(String[] args) {
		int n = io.nextInt();
		int d = io.nextInt();

		int[] blocks = new int[n];
		for(int i = 0; i < n; i++) {
			blocks[i] = io.nextInt();
		}

		Arrays.sort(blocks);

		long ans = 1;

		for(int i = 1; i < n; i++) {
			int lower = Arrays.binarySearch(blocks, blocks[i] - d);
			if(lower < 0) {
				lower = -(lower + 1);
			}

			int inRange = i - lower;

			ans *= (inRange + 1);
			ans %= MOD;
		}

		io.println(ans);
		io.close();
	}

	static class Kattio extends PrintWriter {
		private BufferedReader r;
		private StringTokenizer st;
		// standard input
		public Kattio() { this(System.in, System.out); }
		public Kattio(InputStream i, OutputStream o) {
			super(o);
			r = new BufferedReader(new InputStreamReader(i));
		}
		// USACO-style file input
		public Kattio(String problemName) throws IOException {
			super(problemName + ".out");
			r = new BufferedReader(new FileReader(problemName + ".in"));
		}
		// returns null if no more input
		public String next() {
			try {
				while (st == null || !st.hasMoreTokens())
					st = new StringTokenizer(r.readLine());
				return st.nextToken();
			} catch (Exception e) { }
			return null;
		}
		public int nextInt() { return Integer.parseInt(next()); }
		public double nextDouble() { return Double.parseDouble(next()); }
		public long nextLong() { return Long.parseLong(next()); }
	}
}

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