txt file is free by clicking on the export iconĬite as source (bibliography): Sudoku 4x4 Solver on dCode. The copy-paste of the page "Sudoku 4x4 Solver" or any of its results, is allowed (even for commercial purposes) as long as you cite dCode!Įxporting results as a. Except explicit open source licence (indicated Creative Commons / free), the "Sudoku 4x4 Solver" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Sudoku 4x4 Solver" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Sudoku 4x4 Solver" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app! Ask a new question Source codeĭCode retains ownership of the "Sudoku 4x4 Solver" source code. The number of attempts we will use to go through this process will have an impact on the difficulty level of the resulting grid.The dCode step-wise resolution solves the 4x4 sudoku according to a deductive method, as a human will do, at each step the digit found is indicated as well as the explanation. We can repeat the same process (from step 2) several times using a different value each time to try to remove additional numbers, resulting in a more difficult grid to solve.If not we will have to put the value we took away back in the grid. If the resulting grid only has one solution we can carry on the process from step 2. This site contains Sudoku Solver, a very useful application which is able to solve a sudoku puzzle step-by-step and give you an explanation of each step.Each time a value is removed we will apply a sudoku solver algorithm to see if the grid can still be solved and to count the number of solutions it leads to.From our full grid, we will then remove 1 value at a time.We will add a random element to this solver algorithm to make sure that a new grid is generated every time we run it. To do so will use a sudoku solver algorithm (backtracking algorithm) that we will apply to an empty grid. We have to make sure that these numbers are positioned on the grid following the Sudoku rules. This step is more complex as it seems as we cannot just randomly generate numbers to fill in the grid. Generate a full grid of numbers (fully filled in).Should different algorithms be used to generate Sudoku grids for a specific difficulty level? How could your algorithm be adapted to estimate the difficulty level of a Sudoku grid? Sudoku puzzles are often given a difficulty level such as “Beginner – Intermediate – Advanced – Expert”. You can find an example of such an algorithm by investigating the code provided in this Python Challenge: Sudoku Solver using a Backtracking Algorithm The most common type of Sudoku Solver Algorithm is based on a backtracking algorithm used to investigate all possible solutions of a given grid. Your Sudoku Generator algorithm may need to use a Sudoku Solver Algorithm in order to test whether a generated grid is solvable and to check that it only gives a single solution. This key fact might be useful to help you solve this challenge more effectively. This suggests that the minimum number of clues to provide in a grid is 17. There are effectively numerous examples of grids with 17 clues that have a unique solution but we have never found a well-posed grid with only 16 clues. Sudoku fanatics have long claimed that the smallest number of starting clues a Sudoku puzzle can contain is 17. For instance the output of our algorithm could be a grid such as this one: Our aim for this challenge is not to generate a Sudoku solver algorithm but instead to create an algorithm to be used by a puzzle setter to produce a well-posed Sudoku grid: a grid with a unique solution. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called “boxes”, “blocks”, or “regions”) contain all of the digits from 1 to 9. The generated Sudoku grid should have enough clues (numbers in cells) to be solvable resulting in a unique solution.Ī Sudoku game is number-placement puzzle. Your task is to design an algorithm used to create a Sudoku Grid.
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