Fill Blanks With the Column Maximum

Easy

You get an m × n table of scores grid. A value of -1 marks a blank. Replace every blank with the largest value in its column and return the resulting table. Every column is guaranteed to contain at least one non-negative value.

Example 1

grid=[[5, -1], [-1, 3], [2, 7]] → [[5, 7], [5, 3], [2, 7]]

Column 0 has maximum 5, which fills the blank in row 1; column 1 has maximum 7, which fills the blank in row 0.

Example 2

grid=[[0, 4], [0, 4]] → [[0, 4], [0, 4]]

There are no blanks, so the grid stays the same.

Constraints

2 ≤ m, n ≤ 50
-1 ≤ grid[i][j] ≤ 100
Every column has at least one value ≥ 0

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Topics

Array Matrix

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Input

grid=[[5, -1], [-1, 3], [2, 7]]

Expected

[[5, 7], [5, 3], [2, 7]]

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