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

Empty cells are indicated by the character

'.'

.You may assume that there will be only one unique solution.

A sudoku puzzle...

...and its solution numbers marked in red.

思路:因为题目保证了输入的board肯定可以填充之后变成soduku,本题又是一个回溯的问题,合理的将值放进去就行。遇到不行时,向上回溯

代码如下(已通过leetcode)

public class Solution {

public void solveSudoku(char[][] board) {

genarateboard(board,0,0);

}

private boolean genarateboard(char[][] board,int row,int col) {

// TODO Auto-generated method stub

if (row == 9) return true;

int next_row = col == 8 ? row + 1 : row;

int next_col = col == 8 ? 0 : col + 1;

if (board[row][col] != '.') {

return genarateboard(board, next_row, next_col);

}

for (int i = 1; i <= 9; i++) {

if (!iscontain(board, row, col, (char)('0'+i))) {

board[row][col] = (char)('0' + i);

if (genarateboard(board, next_row, next_col)) return true;

}

}

board[row][col] = '.';

return false;

}

boolean iscontain(char[][] board,int row,int col,char target) {

boolean flag=false;

for(int i=0;i

if(board[i][col]==target) return true;

}

for(int j=0;j

if(board[row][j]==target) return true;

}

int squarerow=row/3;

int squarecol=col/3;

for(int i=3*squarerow;i<=3*squarerow+2;i++) {

for(int j=3*squarecol;j<=3*squarecol+2;j++) {

if(board[i][j]==target) return true;

}

}

return flag;

}

}

javaleetcodeSudokuSolver

因为水平有限,难免有疏忽或者不准确的地方,希望大家能够直接指出来,我会及时改正。一切为了知识的分享。

后续会有更多的精彩的内容分享给大家。