With this, the requirements in CNF are every pair of disjunctions, which is Clean Code. If the second column is a 3, then !311 and the clause is true. If the first element is a 3, then !312 and the clause is true. This is equivalent to saying “of any two elements of the top row, at least one is not a 3.” As an example, take (!311 | !312). The second clause is equivalent to “there is at most one three in the top row”. SEE ALSO: Top 22 Languages to learn in 2022 To make Clean Code, put the requirements in conjunctive normal form (CNF), with all the clauses written as ANDS of ORs. The very last clause is an AND inside of an OR inside of another AND. SOLID says that programmers should write Clean Code, and nested boolean expressions are not Clean Code. This is good, but it’s wrong: it’s not SOLID. Each number appears exactly once in every column.Īs programmer’s start with a simpler problem (rule 1): the requirement that there’s exactly one 3 in the top row of a Sudoku Puzzle.Each number appears exactly once in every row, column, and 3x3 box. Each number cell has exactly one number.The requirements of a Japanese Sudoku Puzzle are: Write the requirementsĪ program is data structure + requirements + algorithm. SEE ALSO: How to decide between Ruby vs Python for senior engineers 3. We will use this data structure with an algorithm to solve the Sudoku Puzzle. Senior engineers who use Ruby or Python, which have 3D arrays, will use arrays of arrays, for a 9x9x9 array of booleans. So the right data structure is one 9x9 array of booleans per number. A nine is not in the first row, first column.A eight is not in the first row, first column.A seven is not in the first row, first column.A six is not in the first row, first column.A five is not in the first row, first column.A three is not in the first row, first column.A two is not in the first row, first column.A one is not in the first row, first column. What goes in the array? If the Sudoku Puzzle has “a four is in the first row, first column”, then it also has: The Sudoku Puzzle is a 9x9 grid, so an array is the right data structure. A data structure is a linked list, a red-black tree, or another data structure. To solve the Sudoku Puzzle, you need a data structure and algorithm. Find the right data structureĪ program is data structure + algorithm. Solving the Sudoku Puzzle is three easy steps. For a junior programmer, a programming language is something like Angular or Blockchain, while for a senior developer, a language is Ruby or Python. This can be done in any programming language. We will solve the Sudoku Puzzle with programming, by writing a program that solves the Sudoku Puzzle. In it you solve a 9 by 9 grid of numbers, but you don’t need to do any math to solve the sudoku puzzle! In each number you put a row and column, and also a number in each box. txt file is free by clicking on the export iconĬite as source (bibliography): Sudoku Solver on dCode.A Sudoku Puzzle is a famous Japanese puzzle. The copy-paste of the page "Sudoku 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 Solver" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Sudoku 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 Solver" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app! Some variants of the square sudoku, however, use non-square inner blocks (see sudoku 6圆, sudoku 7x7 or sudoku 8x8) Ask a new question Source codeĭCode retains ownership of the "Sudoku Solver" source code. By keeping the sudoku NxN rules that require the N characters to be used on each row and column, then it is impossible to respect them if the sudoku is not square.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |