Codehs 8.1.5 Manipulating 2d Arrays -

CodeHS 8.1.5, Manipulating 2D Arrays, requires updating the final element of three specific rows using a helper method to replace placeholder values. The task involves setting row values based on the length of the first array, the sum of specific row elements, and the total count of 2D array elements. For a full walkthrough and solution, visit

Her fingers flew across the interface, typing logical commands into the air. int[] temp = city[7]; (store reference—no! That would just point. She needed a deep copy). She corrected herself: loop through and copy each element. Then recalc. Then assign. Codehs 8.1.5 Manipulating 2d Arrays

for (int row = 0; row < array.length; row++) for (int col = 0; col < array[row].length; col++) System.out.print(array[row][col] + " "); CodeHS 8

Indexing

: Accessing a value requires two indices: array[row][column] . Most 2D-array manipulations are O(M*N) where M =

What a 2D array is

return matrix;

1. Traversing a 2D Array

• Most 2D-array manipulations are O(M*N) where M = numRows and N = numCols because you often visit each element once.
• Transpose, map, sum, and search are typically linear in the number of cells.