if validate for all rows, columns and blocks are passed then Sudoku is valid any duplicate value in any block will fail validation IN Sudoku, we have 9 blocks, each blocks contain 3 rows and 3 columns check if a bit againt the value is already set to one any duplicate value in any column will fail validation The objective is to fill in the rest of the fields such that each row, column and block will contain all digits exactly. Some fields in the grid contain a digit from 1 to 9. Sudoku is a number puzzle where you are presented with a grid of size 9 by 9, that is subdivided in 9 blocks of 3 by 3. check all columns for duplicate values Sudoku is a puzzle that has become very popular recently and has been published in many newspapers. if it is already set,it means program already encounter the value, return false, check if a bit againt the value is already set to one, calculate mask to get or set any particular bit from bitMap any duplicate value in any row will fail validation
#PHP SUDOKU GENERATOR ALGORITHM CODE#
PHP Implementationįollowing php code is for a problem from Leetcode to check if any provided Sudoku is valid or is it already has any duplicate value in any row, column or block.
To finish Sudoku game, user has to be filled all empty cells with a numeric value ranges one to nine (inclusive), in a way that no row, column or block has duplicate value. Each block contains 3 rows and 3 columns, means if you divide 9 rows into 3 parts and 9 columns into 3 parts, you would get 9 squares or blocks.Īny Sudoku, is provided with predefined values (ranges 1-9, inclusive) for some cells and some cells are empty. Logic is, Sudoku consist of 9 rows and 9 columns and 9 blocks.