If we reach to the end of the sudoku, it means that we have found a valid sudoku, and we will print it. If we have tried all the numbers and we still do not find any valid number, we will use backtracking and unmark all the cells that we marked before and repeat the process for new number. If it is not present, we will place the number on the current cell (mark) and move to the next cell which has zero. If that number is already present we will not place it. Before using that number, we will first check whether that number is valid or not by checking whether the current row, column or sub matrix contains the number already. With the help of recursion and backtracking, we will try to place every number from 1 to 9 on the cell where zero is present. Sudoku can be divided into 9, 3 X 3 boxes as shown in the image below. At the start, certain numbers are provided in the Sudoku grid, which serve as clues to help the player gradually solve the entire puzzle. In the diagram there are complete pencil marks for all squares in rows three and seven, and a necessary column/block. ![]() Now, no more squares can be solved with these techniques you are stuck. Largest Number Possible After At Most K SwapsĮach row should have number from 1 to 9 without repetition.Įach 3 X 3 box should have number from 1 to 9 without repetition. 1 is partially solved using easy and medium difficulty solving techniques: singles, hidden singles and column/block intersections. ![]() Nknights Combinations - 2d As 1d - Knight Chooses Nqueens Combinations - 2d As 1d - Queen Chooses Nqueens Permutations - 2d As 1d - Queen Chooses Queens Combinations - 2d As 1d - Queen Chooses ![]() Queens Combinations - 2d As 2d - Queen Chooses Queens Permutations - 2d As 2d - Box Chooses However the best way to start is the other way round - finding. Queens Combinations - 2d As 2d - Box Chooses The obvious way to solve a sudoku puzzle is to find the right numbers to go in the squares. Queens Permutations - 2d As 2d - Queen Chooses
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