Sudoku is a logicbased, combinatorial, numberplacement puzzle. 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", "regions", or "subsquares") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which typically has a unique solution. Or we can say, the same single integer may not appear twice in the same 9×9 playing board row or column or in any of the nine 3×3 subregions of the 9×9 playing board. Now you are given a partially filled Sudoku board that has a unique(唯一) solution. Your task is to fill the board.


Given Sudoku Puzzle 
Puzzle with Solution 