Web Reference: Jul 28, 2025 · Instead of looping through every cell in each rectangle which is inefficient on large grids the 2D difference array lets you apply each update in O (1) time by marking only the rectangle’s boundaries. Jan 16, 2026 · In this blog, we’ll demystify diagonal traversal of 2D arrays. We’ll start by understanding what diagonals are in a matrix, explore methods to loop through them, and finally focus on printing the "other half" of diagonals (e.g., the lower triangular diagonals relative to the main diagonal). Diagonal Traverse - Given an m x n matrix mat, return an array of all the elements of the array in a diagonal order.
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