P1102 A-B 数对

import java.util.Scanner;
public class Main {public static void main(String[] args) {Scanner sc = new Scanner(System.in);int n = sc.nextInt();int c = sc.nextInt();int[] res = new int[n+1];for(int i=1;i<=n;i++)res[i] = sc.nextInt();int sum = 0;for(int i=1;i<=n;i++) {for(int j=1;j<=n;j++) {if((res[i]-res[j]) == c) {sum++;}}}System.out.println(sum);}
}