![]() Let's see the implementation based on the algorithm defined above. Step 4: If the total number of unassigned locations in the grid is zero, then return true. We know that there is only one number left to place here. For example, in the grid shown here, there is a vertical column (the 4th column from left, outlined in orange) that has 8 out of 9 numbers already placed. #Correct sudoku example how toIf there is no recursive call that returns true, then return false. Unfortunately, beginner Sudoku players often do not know how to recognize even the easiest opportunities that are right in front of them. if any of the recursive calls return true, then terminate the loop by returning true. If the grid is safe, then recursively invoke the method for all the safe cases from 1 to 9. If the unassigned location is present, then assign a number from 1 to 9, check if the number that is assigned to the current index makes the grid safe or not Step 3: Look for the unassigned location in the grid. Only the filled cells need to be validated according to the mentioned rules. Step 2: Write a recursive function that accepts the grid as the input. A Sudoku board (partially filled) could be valid but is not necessarily solvable. Instead of HashMap, one can use loops also. If the HashMap shows the frequency of any number greater than 1, then return false, else return true. For the boxes, column, and row, create a HashMap for storing the frequency of the numbers. Step 1: Create a function whose work is to check whether the grid is safe or not when a number is assigned to the current index. ![]() If none of the numbers from 1 to 9 leads to a solution, then false is returned, and the message "the solution does not exit" is displayed. ![]() If the assignment does not lead to the solution, then we take another number and repeat the process. If the same number is not present, then the number is assigned, and then we check recursively whether this assignment leads to the solution or not. If the same number is present, then we take another number and check its safety. Before assigning any number, we check whether the same is present in the current column, current row, or the current 3 x 3 sub-grid or not. In this approach, we assign numbers one-by-one to empty cells. (Greek, letter, number, symbol) are examples of categorical data. ![]() To fill the numbers in the empty cells, we will use backtracking approach to solve the puzzle. The variables correct (whether or not the student got the Sudoku correct) and Sudoku type. It indicates that the cells of the grid containing 0 are empty and need to be filled. Sudoku is a logic-based puzzle that uses combinatorial-number placement. ![]()
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