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

37. Sudoku Solver


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.


  • 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.



  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。

空白格用 '.' 表示。


  • 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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