solve sudoku

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode 036. Valid Sudoku (Easy) link : Title: https://leetcode.com/problems/valid-sudoku/Code (GitHub): Https://github.com/illuz/leetcode : Determine whether a Sudoku is effective.Effective Sudoku is not forced to have soluti

Yesterday, I saw a female laser searching for male gods on the Internet. The puzzle is a digital card. If you are interested, try to crack it. I heard that it was Bai fumei (Weibo is @ Mu huakai 1990) who met a man while traveling in Guilin. The man left such a digital card and left. Both of them work in Shenzhen. Bai fumei fell in love with the man at first sight, but he did not know how to crack the digital card. Go back to Shenzhen and ask for help at Diwang Tower on June 15th to crack this

Problem descriptionXiaocheng and Xiaohua are both good students who love mathematics. Recently, they fell in love with the sudoku game, and they wanted to use the sudoku for a better match. But the common Sudoku is too simple for them, so they asked Dr. Z for advice, and Dr. Z took out the "target-shaped Sudoku" he rec

Leetcode notes: Valid Sudoku, leetcodesudoku I. Description Determine if a Sudoku is valid, according to: Sudoku Puzzles-The Rules:Http://sudoku.com.au/TheRules.aspx.The Sudoku board cocould be partially filled, where empty cells are filled with the character '.'. The following figure: A partially filled

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. Method: the key to solving this problem is to try it one by one in the alternative set. Not every space can start with a u

Label: Java leetcode 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. Idea 1: use violent DFS public class Solution {private boolean isValidSudoku(char[][] b

Label: style blog HTTP color Io AR for SP Div Question: 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. This question is more difficult than determinin

four 1 columns in the (I * n + J) * n + k rows, and the columns are: I * n + k-1 N * n + J * n + k-1 2 * n + block (I, j) * n + k-1 3 * n + I * n + J Otherwise, insert n rows, k = 1 to n. If n = 16, there are 4096 rows and 1024 columns, and the matrix traversal needs to be 4096*1024 = 4194304 times, However, the number of 1 entries is only 4096*4 = 16384, and it takes only 16384 times for the dancing links traversal. In this comparison, we can see that dancing links saves a lot of time. You can

);break; Case R.id. item3:Intent intent3=New Intent (This, newgame. Class);StartActivity (INTENT3);break;default:break;}return Super. onoptionsitemselected (item);}}Run Result: ()1. Five, Experimental summary (analysis of the results of the experiment, experience and improvement of experimental ideas) Through the experiment mastered the use of Actionbar, using Actionbar display optionmenu menu items MenuItem, in the experiment encountered problems by asking teachers,

Analysis:DLX is to optimize the data structure of the 01 matrix accurate coverage and repeated coverage from the point of view, it uses the cross-linked list to store only the non-0 of the Matrix, while the 01 matrix is more and more sparse in the DFS process, and every time the recovery is wasted, DLX happens to solve both problems. The key point is to transform the Sudoku problem into a 01 matrix exact ov