洛谷1102 A-B 暴力法

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner input = new Scanner(System.in);
        int n=input.nextInt();
        int c=input.nextInt();
        int[] a=new int[n];
        for(int i=0;i<n;i++){
            int num=input.nextInt();
            a[i]=num;
        }
        System.out.println(find(a,c));
    }
    public static int find(int[] a,int c){
        int n = a.length;
        int res = 0;
        for (int i = 0; i < a.length; i++) {
            int j=i+1;
            while (j<n){
                if(Math.abs(a[j]-a[i])==c){
                    res++;
                }
                j++;
            }
        }
        return res;
    }
}