Similar to Problem 42501. Toeplitize a matrix, let's consider Hankelization of a matrix.

Given an input matrix A, convert it to a Hankel matrix B by replacing each skew-diagonal of A with its mean. For example,

Input

   A = [3     7    10     2
        3     5     1     2
        6     3     2     7]

Output:

   B = [3     5     7     2 
        5     7     2     2
        7     2     2     7]
Solve

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Last Solution submitted on Jan 14, 2026

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zy 蒋 meiting 轲宸

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