Is pattern printing actually useful for interviews?
The patterns themselves aren't asked, but the nested loop logic and boundary math you learn are heavily tested in matrix traversal problems (like 'Spiral Matrix' or 'Rotate Image').
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More FAQs in The Role of Nested Loops in Pattern Printing
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]).
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.
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