It’s even easier to set the message to display when it runs in each variable. Using set helps do the same operation as the previous code. 8 at row 0, 8 at column 0, 8 at box 0, 0 3 at row 0, 3 at column 1, 3 at box 0, 0 7 at row 0, 7 at column 4, 7 at box 0, 1 6 at row 1, 6 at column 0, 6 at box 0, 0 1 at row 1, 1 at column 3, 1 at box 0, 1 9 at row 1, 9 at column 4, 9 at box 0, 1 5 at row 1, 5 at column 5, 5 at box 0, 1 9 at row 2, 9 at column 1, 9 at box 0, 0 8 at row 2, 8 at column 2, 8 at box 0, 0 falseĪs you would observe, it’s pretty similar to the four functions approach. It will also return each message from the variables row, column and box as requested in the console.log on line 11. Not only the result for this board is false.

A function that returns the result for the entire sudoku board.

Let’s start first by thinking about what we need:

Each of the nine 3 x 3 sub-boxes of the grid must contain the digits 1–9 without repetition.

Each column must contain the digits 1–9 without repetition.

Each row must contain the digits 1–9 without repetition.

Sudoku’s description itself makes it very clear what we need to accomplish (not that it’s simple, but at least the instructions make it look like that). So let’s supposed this is our board composed of an array. In Leetcode’s Valid Sudoku, we must code a function that will determine if a board is valid or not. Hence the Japanese name means “Single Number.” However, the modern version we know was published in 1986 by a Japanese company named Nikoli.

Variations of this popular puzzle started to publish in French newspapers in the 19th century. In sudoku, the objective is to fill a 9 x 9 grid with digits so that each row, column, and 3 x 3 subgrids contain all of the digits, from number 1 to number 9.

A data structure exercise inspired by the logic-based, combinatorial number-placement puzzle. The data structure exercise done recently was Valid Sudoku. Those exercises often come across as puzzles, to the point some of those exercises are based on actual puzzles. For example, Leetcode has thousands of exercises we practice to keep our minds in shape and ready for technical questions. Just click & print.Ĭhoose your level and print your sudoku, you can create you own sudoku book up to 12 pages.ġ2 pages of easy sudokus, print the grids.ġ2 pages of medium sudokus, print the grids.ġ2 pages of hard sudokus, print the grids.ġ2 pages of diabolic sudokus, print the grids.When preparing for a Software Engineer job interview, one of the things we do is practice algorithms.

Sudoku with solution