```
    import java.util.\*;
    
    public class Example {
        public static void main(String[] args) {
            int[][] hours = {
                    {2, 4, 3, 4, 5, 8, 8},
                    {7, 3, 4, 3, 3, 4, 4},
                    {3, 3, 4, 3, 3, 2, 2},
                    {9, 3, 4, 7, 3, 4, 1},
                    {3, 5, 4, 3, 6, 3, 8},
                    {3, 4, 4, 6, 3, 4, 4},
                    {3, 7, 4, 8, 3, 8, 4},
                    {6, 3, 5, 9, 2, 7, 9}
            };
            int[] weeklyHrs = new int[hours.length];
            for (int i = 0; i < hours.length; i++) {
                for (int j = 0; j < hours[i].length; j++) {
                    weeklyHrs[i] = weeklyHrs[i] + hours[i][j];
                }
            }
            for (int i = 0; i < weeklyHrs.length; i++) {
                System.out.print("Employee" + i + ":" + weeklyHrs[i]);
                System.out.println();
            }
            System.out.println();
            int[][] wHTwoD = new int[8][2];
            for (int i = 0; i < 8; i++) {
                for (int j = 0; j < 2; j++) {
                    if (j % 2 == 0) {
                        wHTwoD[i][j] = i;
                    } else {
                        wHTwoD[i][j] = weeklyHrs[i];
                    }
                }
            }
    
            for (int i = 0; i < 8; i++) {
                for (int j = 0; j < 2; j++) {
                    System.out.print(wHTwoD[i][j]);
                }
                System.out.println();
            }
    
            for (int i = 0; i < weeklyHrs.length; i++) {
                System.out.print(weeklyHrs[i] + " ");
            }
        }
    
        public static void sort(int[] arr) {
            int temp;
            for (int i = 0; i < arr.length; i++) {
                for (int j = i; j < arr.length; j++) {
                    if (arr[j] < arr[i]) {
                        temp = arr[i];
                        arr[i] = arr[j];
                        arr[j] = temp;
                    }
                }
            }
        }
    }
    ```
    
    # Question
    Suppose the weekly hours for all employees are stored in a two-dimensional array. Each row records an employee's seven-day work hours with seven columns. For example, the following array stores the work hours for eight employees. Write a program that displays employees and their total hours in increasing order of the total hours.
    
    ![image|304x214](upload://26QTnP5J4bcdJhLotm09GZb5rXP.png)
    
    I got the total  weekly hours of each employees in a 1d array like this
    
    ```
            int[] weeklyHrs = new int[hours.length];  
            for (int i = 0; i < hours.length; i++) {  
                for (int j = 0; j < hours[i].length; j++) {  
                    weeklyHrs[i] = weeklyHrs[i] + hours[i][j];  
                }  
            }  
    ```
    
    However, now I need to sort it and I need to track the index of unsorted array even after sorting it. So far, the book hasn't started on how to sort 2d array. So I am not going to use this as I take this as a kind of drill.
    
    My concern is simple: How do I track the index of unsorted array after sorting that array?