CodeSignal [60/60] sudoku

Problem:

Sudoku is a number-placement puzzle. The objective is to fill a 9 × 9 grid with digits so that each column, each row, and each of the nine 3 × 3 sub-grids that compose the grid contains all of the digits from 1 to 9.

This algorithm should check if the given grid of numbers represents a correct solution to Sudoku.

 

Example

• For

the output should be
sudoku(grid) = true;

• For

the output should be
sudoku(grid) = false.

The output should be false: each of the nine 3 × 3 sub-grids should contain all of the digits from 1 to 9.
These examples are represented on the image below.

 

 

-Summary-

1. Create a 3 different function to check if it is valid sudoku (row/col/3x3 box).

2. Loop through each function and check if it is valid.

3. Return true if all function pass.

 

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