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…

Write a program to solve a Sudoku puzzle by filling the empty cells. A sudoku solution must satisfy all of the following rules: Each of the digits 1-9 must occur exactly once in each row. Each of the digits 1-9 must occur exactly once in each column.…

题目描述: 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. 解题思路:…

Write a program to solve a Sudoku puzzle by filling the empty cells. A sudoku solution must satisfy all of the following rules: Each of the digits 1-9 must occur exactly once in each row. Each of the digits 1-9 must occur exactly once in each column.…

题目链接: https://leetcode.com/problems/sudoku-solver/?tab=Description   Problem : 解决数独问题,给出一个二维数组,将这个数独进行求解.   思路: 嵌套循环,三层循环体,每一行,每一列,填入从1到9的数字.判断填入之后是否合理 判断数独是否合理的函数   参考代码:    package leetcode_50; /*** * * @author pengfei_zheng * 求解数独问题 */ public clas…

1 题目: 根据给出的数独,全部填出来 2 思路: 为了做出来,我自己人工做了一遍题目给的数独.思路是看要填的数字横.竖.子是否已经有1-9的数字,有就剔除一个,最后剩下一个的话,就填上.一遍一遍的循环,直到填完为止. 后来发现,这个思路只能解决部分数独.还有部分数独是需要回溯的,比如,这个位置只能填3或5,那么就需要先填上3,看看能否继续填下去,不能的话,再回过来填5. 想了半天,想不出来,把别人的backtracking看懂了,写出来了.. 3 代码: 自己的: Hashtable<Inte…

求数独,只要求做出一个答案就可以. 刚开始对题意理解错误,以为答案是唯一的, 所以做了很久并没有做出来,发现答案不唯一之后,使用回溯.(还是借鉴了一下别人) public class Solution { public void solveSudoku(char[][] board) { HashSet[] hashset = new HashSet[27]; for (int i = 0; i < 27; i++) hashset[i] = new HashSet<Character>…

# -*- 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…

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 in re…

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 in re…

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. A sudoku puzzle... ...and its solution numbers marked in red. 题意分析: 本题是要解…

解决数独 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... 思路: 搜索加剪枝. 首先设立3个辅助二维数组:rows,  columns, grids来维护目…

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. 链接: htt…

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…

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. ; bool row_mask[SodukuSize][SodukuSize]; bool col_mask[SodukuSize][Soduku…

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. class Solut…

▶ 有关数独的两个问题. ▶ 36. 检测当前盘面是否有矛盾(同一行.同一列或 3 × 3 的小框内数字重复),而不关心该盘面是否有解. ● 初版代码,24 ms,没有将格子检测函数独立出去,行检测.列检测.框检测是否合并为一个循环对速度的影响不明显.最快的解法算法与之相同,蜜汁优化 static vector<vector<char>> board = []() {std::ios::sync_with_stdio(false); cin.tie(NULL); return ve…

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1:使用暴力DFS…

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…

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…

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 partially filled sudoku which is valid. Note: A valid Sudoku boa…

最近,新加坡总理李显龙也写了一份代码公布出来,大致瞧了一眼,竟然是解数独题的代码!前几天刚刚写过,数独主要算法当然是使用回溯法.回溯法当时初学的时候在思路上比较拧,不容易写对.写了几个回溯法的算法之后心里总算有了点底.回溯法的代码一般都是长成下面这样子: void backtracking(int[] arr, int boundary, int current, int[] result) { if(current>=boundary) //到达终止条件 { //判断result是否符合要求…

1. Reverse Nodes in k-Group Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. k is a positive integer and is less than or equal to the length of the linked list. If the number of nodes is not a multiple…

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 partially filled sudoku which is valid. Note:A valid Sudoku board (partially…

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 partially filled sudoku which is valid. Note: A valid Sudoku boa…

leetcode 36 感觉就是遍历. 保存好状态,就是各行各列还有各分区divide的情况 用数组做. 空间小时间大 class Solution { public: bool isValidSudoku(vector<vector<char>>& board) { int row[9][9]={0},col[9][9]={0},div[9][9]={0}; int temp=0,dnum; for(int i=0;i<9;i++){ for(int j=0;j&l…

https://leetcode.com/problems/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 partially filled sudoku which is…

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…