Please explain in JAVA

GIVEN:

using System.CodeDom.Compiler;

using System.Collections.Generic;

using System.Collections;

using System.ComponentModel;

using System.Diagnostics.CodeAnalysis;

using System.Globalization;

using System.IO;

using System.Linq;

using System.Reflection;

using System.Runtime.Serialization;

using System.Text.RegularExpressions;

using System.Text;

using System;

class Solution {

// Complete the divisibleSumPairs function below.

static int divisibleSumPairs(int n, int k, int[] ar) {

//SOLUTION HERE

}

static void Main(string[] args) {

TextWriter textWriter = new StreamWriter(@System.Environment.GetEnvironmentVariable("OUTPUT_PATH"), true);

string[] nk = Console.ReadLine().Split(' ');

int n = Convert.ToInt32(nk[0]);

int k = Convert.ToInt32(nk[1]);

int[] ar = Array.ConvertAll(Console.ReadLine().Split(' '), arTemp => Convert.ToInt32(arTemp))

;

int result = divisibleSumPairs(n, k, ar);

textWriter.WriteLine(result);

textWriter.Flush();

textWriter.Close();

}

}

Divisible Sum Pairs H Hacker Rank You are given an array of n integers, do, Q1,...,An-1, and a positive integer, k. Find and print the number of (1,j) pairs where i