# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 37: Sudoku Solverhttps://oj.leetcode.com/problems/sudoku-solver/ Write a program to solve a Sudoku puzzle by filling the empty cells.Empty cells are indicated by the character '.'.You may a…

题目要求:Sudoku Solver 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…

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. 解题思路: 经典的NP问题,采用Dancing Links可以优化算法,参考链接:https://www.ocf.berkeley.edu/~jc…

题目: 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. 这题相对上题值…

写一个程序通过填充空格来解决数独.空格用 '.' 表示. 详见:https://leetcode.com/problems/sudoku-solver/description/ class Solution { public: bool solveSudoku(vector<vector<char> > &board) { for (int i = 0; i < 9; ++i) for (int j = 0; j < 9; ++j) { if ('.' == b…

题目 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- 分析 与36 Valid Sudoku本质相同的题目,上一题要求判定所给九宫格能否满足数独要求,本题要求给…

[题目] 每一行.每一列.每个3*3的格子里只能出现一次1~9. [思路] 参考了思路,附加了解释. dfs遍历所有非空格子,n是已经填好的个数. 初始化条件.n=81,都填了,返回结束.对于已经填好的b[x][y] != '.'跳过,到下一个. xy的设计保证先行后列填写. if (n == 81) return true; int x = n / 9; int y = n % 9; if (b[x][y] != '.') return dfs(b, n + 1); 开始填数字,validat…

题目链接:Sudoku Solver | LeetCode OJ 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 n…

三星机试也考了类似的题目,只不过是要针对给出的数独修改其中三个错误数字,总过10个测试用例只过了3个与世界500强无缘了 36. Valid Sudoku Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules. The Sudoku board could be partially filled, where empty cells are filled with the character '.'. A…

Leetcode之回溯法专题-37. 解数独(Sudoku Solver) 编写一个程序,通过已填充的空格来解决数独问题. 一个数独的解法需遵循如下规则: 数字 1-9 在每一行只能出现一次.数字 1-9 在每一列只能出现一次.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. 解法: 分析: 给定一个9*9的char型的二维数组,数组里已经填好了一些数字,要求生成一个数独. 本题可以用回溯法,在空的格子里填下1-9数字,全部填完后,判断是否为数独,是->保…