Given a matrix x with n rows and m columns, return a matrix y with n rows and 2m columns, such that every row in x is sorted from low to high and then from high to low.

Example:

x = 9  2  8  1
    5  4  9  8
    8  9  6  9

y = 1  2  8  9  9  8  2  1
    4  5  8  9  9  8  5  4
    6  8  9  9  9  9  8  6
Solve

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Last Solution submitted on Dec 23, 2025

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Alexander Ross Hong Son Kathleen qiushui

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