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37. Sudoku Solver.go
37. Sudoku Solver_test.go

# 37. Sudoku Solver

## 题目:

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

A sudoku solution must satisfy all of the following rules:

1. Each of the digits `1-9` must occur exactly once in each row.
2. Each of the digits `1-9` must occur exactly once in each column.
3. Each of the the digits `1-9` must occur exactly once in each of the 9 `3x3` sub-boxes of the grid.

Empty cells are indicated by the character `'.'`.

A sudoku puzzle...

...and its solution numbers marked in red.

Note:

• The given board contain only digits `1-9` and the character `'.'`.
• You may assume that the given Sudoku puzzle will have a single unique solution.
• The given board size is always `9x9`.

## 题目大意

1. 数字 1-9 在每一行只能出现一次。
2. 数字 1-9 在每一列只能出现一次。
3. 数字 1-9 在每一个以粗实线分隔的 3x3 宫内只能出现一次。

## 解题思路

• 给出一个数独谜题，要求解出这个数独
• 解题思路 DFS 暴力回溯枚举。数独要求每横行，每竖行，每九宫格内，`1-9` 的数字不能重复，每次放下一个数字的时候，在这 3 个地方都需要判断一次。
• 另外找到一组解以后就不需要再继续回溯了，直接返回即可。
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