通过加法或减法找到一个等于一组数字的数字

Question

the user must input a set of numbers of type double that we must then find the number that equalizes the numbers

here is a link to the question

https://www.dropbox.com/s/0hlps5r8anhjjd8/group.jpg

I tried to solve it myself, I did the basics, but for the actual solution I don't even know where to start ?_? any hint would be much helpful

Here my attempt:

import java.util.Scanner;

public class test {

    public static void main(String[] args){ 
        Scanner input = new Scanner(System.in);
        int     arr    =1000000;

        while(arr > 10000) {        
            System.out.println("enter number of students that are providing the money");
            arr = input.nextInt();                   //user input for the size of the array
        }

        double size[] = new double[arr];             //array creation , size based on user input

        for (int i =0; i<size.length;i++) {          //to input values into the array
            System.out.println("enter amount of money");
            size[i] = input.nextDouble();            //input values into the array
        }   

        for(int i=0; i<size.length;i++) {            //prints out the array
            System.out.println(size[i]);
        }
    }

}

Thank you in advance

Answer 1

Step 1. Read the data for a test case and put it into a suitable structure. I would probably choose a double contribution[] for this assignment.

Step 2. Calculate the average contribution, avg.

Step 3. Sum up the amount of money that need to change hands. sum over abs(contribution[i]-avg). Note: Don't forget to divide the total by 2.