/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
private static final Scanner scanner
= new Scanner
(System.
in);
{
String [] nm
= scanner.
nextLine().
split(" ");
String[] arrStr
= scanner.
nextLine().
split(" "); int[] arr = new int[arrStr.length];
int resp = 0;
//System.out.println(n);
//System.out.println(k);
for (int i = 0; i < arr.length; i++){
arr
[i
] = Integer.
parseInt(arrStr
[i
]); }
/*
for (int i = 0; i < arr.length; i++){
System.out.println(arr[i]);
}
*/
// Here the algorith begins, I take 10 minutes to format the input.
for (int i = 0; i < arr.length; i++){
for (int j = 0; j < arr.length; j++){
if (i
!=j
&& Math.
abs(arr
[i
]-arr
[j
]) <= k
){ resp = resp + 1;
}
}
}
// O(n´2)
System.
out.
println("Respuesta: "+ resp
);
}
}
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