[leetcode]37. Sudoku Solver 解数独
Write a program to solve a Sudoku puzzle by filling the empty cells.
A sudoku solution must satisfy all of the following rules:
SRE实战 互联网时代守护先锋，助力企业售后服务体系运筹帷幄！一键直达领取阿里云限量特价优惠。- Each of the digits
1-9must occur exactly once in each row. - Each of the digits
1-9must occur exactly once in each column. - Each of the the digits
1-9must occur exactly once in each of the 93x3sub-boxes of the grid.
Empty cells are indicated by the character '.'.
![[leetcode]37. Sudoku Solver 解数独 随笔 第1张](https://img.liuyixiang.com/image/2019/4/ZzyIne.png "[leetcode]37. Sudoku Solver 解数独 随笔 第1张")
A sudoku puzzle...
![[leetcode]37. Sudoku Solver 解数独 随笔 第2张](https://img.liuyixiang.com/image/2019/4/fIbyEn.png "[leetcode]37. Sudoku Solver 解数独 随笔 第2张")
...and its solution numbers marked in red.
Note:
- The given board contain only digits
1-9and the character'.'. - You may assume that the given Sudoku puzzle will have a single unique solution.
- The given board size is always
9x9.
题意：
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