제출 #928188

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
928188		crystal	A Huge Tower (CEOI10_tower)	Java	30 / 100	880 ms	45808 KiB

tower

import java.util.*;

public class tower {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		int [] vals = new int [n];
		for(int i =0;i<n;i++) {
			vals[i]=sc.nextInt();
		}
		Arrays.sort(vals);
		int r=0;
		long ans =1;
		for(int i=0;i<n;i++) {
			while(r+1<n&&vals[r+1]-vals[i]<=m) {
				r++;
			}
			ans*=((long)r-i+1)%1000000000;
			ans%=1000000000;
		}
		System.out.println(ans);
	}
}

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