Examples:

Input: mat = [[10, 20, 30, 40], [15, 25, 35, 45], [27, 29, 37, 48], [32, 33, 39, 50]] Output: Elements of matrix in sorted order [10, 15, 20, 25, 27, 29, 30, 32, 33, 35, 37, 39, 40, 45, 48, 50]

This problem has an existing solution, please refer to combining two sorted arrays using ** heapq module ** .

` `

` ` ` # A function to print all elements in sorted order `

` # from a matrix sorted by row and column `

` from `

` heapq `

` import `

` merge `

` def `

` sortedMatrix (mat ): `

` # initialize the result variable with the first line matrices `

` result `

` = `

` mat [`

` 0 `

`] `

` # now go through the full matrix `

` # after the first row and concatenate each row with `

` # result one by one `

` # after the last operation, the result will contain `

` # list of sorted matrix elements `

` for `

` row `

` in `

` mat [`

` 1 `

`:]: `

` `

` result `

` = `

` list `

` (merge (result, row)) `

` `

` `

` return `

` result `

` `

` if `

` __ name__ `

` = `

` = `

` "__ main__" `

`: `

` `

` mat `

` = `

` [[`

` 10 `

`, `

` 20 `

`, `

` 30 `

`, `

` 40 `

`], [`

` 15 `

`, `

` 25 `

`, `

` 35 `

`, `

` 45 `

`], `

` [`

` 27 `

`, `

` 29 `

`, `

` 37 `

`, `

` 48 `

`], [`

` 32 `

`, `

` 33 `

`, `

` 39 `

`, `

` 50 `

`]] `

` `

` print `

` ’Elements of matrix in sorted order’ `

` `

` print `

` sortedMatrix (mat) `

` `

Output:

Elements of matrix in sorted order [10, 15, 20, 25, 27, 29, 30, 32, 33, 35, 37, 39, 40, 45, 48, 50]

This article courtesy of ** Shashankom Mishra (Gullu) ** . If you are as Python.Engineering and would like to contribute, you can also write an article using contribute.python.engineering or by posting an article contribute @ python.engineering. See my article appearing on the Python.Engineering homepage and help other geeks.

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