Leetcode Sudoku Solver python

Source: Internet
Author: User

#

Write a program to solve a Sudoku puzzle by filling the empty cells.

Empty cells is indicated by the character ‘.‘ .

Assume that there would be is only one unique solution.

A Sudoku Puzzle ...

... and its solution numbers marked in red.



Classsolution (object):defSolvesudoku (self, Board):""": Type BOARD:LIST[LIST[STR]]: rtype:void do not return anything, modify board In-place instead. """ defisValid (x, y): tmp=Board[x][y] Board[x][y]='D' forIinchRange (9): ifBoard[i][y] = =tmp:returnFalse forIinchRange (9): ifBoard[x][i] = =tmp:returnFalse forIinchRange (3): forJinchRange (3): ifboard[(X/3) *3+i][(Y/3) *3+j] = =tmp:returnFalse Board[x][y]=tmpreturnTruedefDFS (board): forIinchRange (9): forJinchRange (9): ifBOARD[I][J] = ='.': forKinch '123456789': Board[i][j]=kifIsValid (I,J) andDFS (board):returnTrue Board[i][j]='.' returnFalsereturnTrue DFS (board)

Leetcode Sudoku Solver python

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