Similar to Problem 3094. Hankelize a matrix, now consider Toeplitization of a matrix.

Given an input matrix A, convert it to a Toeplitz matrix B by replacing the diagonal of A with the mean of the respective diagonal. For example,

Input

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

Output:

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

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Last Solution submitted on Jan 14, 2026

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