Leetcode 1329. Sort the Matrix Diagonally

Given an m x n integer matrix, sort the elements along each top-left to bottom-right diagonal independently in ascending order and return the resulting matrix. A useful observation is that cells on the same diagonal share the same i-j index, so you can group and reorder each diagonal separately (m,n ≤ 100, values 1..100).

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Early June, 2025

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Leetcode 1329. Sort the Matrix Diagonally

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