The answer
The outer loop (rows) maps perfectly to the first index of a 2D array (matrix[row]), and the inner loop (columns) maps to the second index (matrix[row][col]).
The Role of Nested Loops in Pattern Printing
How do pattern loops map to 2D arrays?
More FAQs in The Role of Nested Loops in Pattern Printing
It represents traversing the lower triangular half of an N x N matrix, often used in dynamic programming or checking array pairs.
Use a square N x N loop setup, and only print a star if the row index exactly equals the column index (if i == j). Otherwise, print a space.
They stem from mathematical notation for matrices, where 'i' represents the row vector and 'j' represents the column vector.
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