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We need to sort the diagonals of a square matrix in two different ways based on their position relative to the main diagonal. The diagonals in the bottom-left triangle (including the main diagonal) should be sorted in non-increasing order, while the diagonals in the top-right triangle should be sorted in non-decreasing order.

Approach

  1. Group Elements by Diagonal: Each diagonal in the matrix can be identified by the difference d = i - j, where i is the row index and j is the column index. Diagonals with d >= 0 belong to the bottom-left triangle, and those with d < 0 belong to the top-right triangle.
  2. Sort Each Group: For each diagonal group:
    • If d >= 0, sort the elements in non-increasing o…

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@kovatz
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kovatz Aug 28, 2025
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@mah-shamim
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mah-shamim Aug 28, 2025
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Answer selected by kovatz
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