What is jagged 2D array?
A jagged array is a 2D array where the rows have varying lengths. This is why the inner loop bounds should always use grid[row].length dynamically.
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More FAQs in Printing 2D Grids and Matrices Using Nested Loops
A matrix is two-dimensional. You need an outer loop to traverse vertically through the rows, and an inner loop to traverse horizontally through the columns.
It is standard 2D array access notation. It retrieves the exact value located at the specified row (Y-axis) and column (X-axis) coordinate.
If N is the width of a square matrix, traversing the N x N grid takes O(N^2) operations. However, relative to the total number of items (M), the traversal is O(M) linear time.
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