July 19, 2015
Problem statement:
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.
Solution 1:
Great blog to read:
http://blog.csdn.net/fightforyourdream/article/details/16916985
And then, start to implement the solution using C# code:
https://github.com/jianminchen/sudokuSolver/blob/master/Program.cs
Solution 2:
Read the blog,
http://blog.csdn.net/linhuanmars/article/details/20748761
and then, implement the solution using c# code:
https://github.com/jianminchen/sudokuSolver/blob/master/Program2.cs
Solution 3: (good workout on C# KeyValuePair class)
and then, convert C++ code to C# code from the blog:
https://github.com/yinlinglin/LeetCode/blob/master/SudokuSolver.h
Excellent code in C++, using class for node on the board. Learn a few things, fun to play with the code
C# code:
https://github.com/jianminchen/sudokuSolver/blob/master/Program3.cs
solution 4:
https://github.com/jianminchen/sudokuSolver/blob/master/Program4.cs
source code from the blog:
https://github.com/xiaoxq/leetcode-cpp/blob/master/src/SudokuSolver.cpp
Solution 5:
read the blog: (Good coding! practice more based on this blog)
https://github.com/zwxxx/LeetCode/blob/master/Sudoku_Solver.cpp
and convert the C++ code to C# code, (great workout on C# LinkedList for blank nodes)
https://github.com/jianminchen/sudokuSolver/blob/master/Program5.cs
Solution 6:
read the blog:
http://shanjiaxin.blogspot.ca/2014/04/sudoku-solver-leetcode.html
and convert Java code to C# code, great workout on C# and logic checking "return false"
https://github.com/jianminchen/sudokuSolver/blob/master/Program6.cs
Solution 7:
blog:
http://www.jiuzhang.com/solutions/sudoku-solver/
C# code:
https://github.com/jianminchen/sudokuSolver/blob/master/Program7.cs
Solution 8:
Thanks for the blog's highlight line of code on back tracking; finally, I got it! My logic thinking has flaws on back tracking;
extra backtracking is not a good. Minimize the back tracking, only do it when "return false". It makes sense to do that.
blog:
http://bangbingsyb.blogspot.ca/2014/11/leetcode-valid-sudoku-sudoku-solver.html
C# code:
https://github.com/jianminchen/sudokuSolver/blob/master/Program8.cs
Solution 9:
blog:
http://www.cnblogs.com/TenosDoIt/p/3800485.html
C# code:
https://github.com/jianminchen/sudokuSolver/blob/master/Program9.cs
Solution 10:
blog: (Excellent implementation! no extra line or number in the code! Best for memorization! Go through other solutions later. )
https://github.com/rffffffff007/leetcode/blob/master/Sudoku%20Solver.java
C# code:
https://github.com/jianminchen/sudokuSolver/blob/master/Program10.cs
算法理解了, 代码可以记住了; 开始看不同的题解, 看看高手的代码; 从不同的题解中, 模仿模仿! 像打网球, 多接触不同的打法,
开阔眼界; 接着看这道题的题解. 试着从不同角度看一个问题, 多练习改代码; 看自己能不能有自己的看法, 去尝试一点更改,
玩一点花样; 增加练习C#编程的机会.
Also, the code written has been work on readability, learned through my favorite book reading:
http://shop.oreilly.com/product/9780596802301.do
Those favorite rules I like to learn, pick up and follow:
Big fan of DRY (Do not repeat yourself) principle, do one thing a time, break giant expression, using explaining variable or summary
variable, and abstract the thing to a function, extract a subproblem to a function. The code is also modified to fit into short memory,
less mental baggage to read through.
Read solutions:
https://github.com/jordandong/myleetcodes/blob/master/SudokuSolver.cpp
https://github.com/Sayericplz/myleetcode/blob/master/isValidSudoku.cpp
BFS, using queue - try to convert it to C#
http://yucoding.blogspot.ca/2013/12/leetcode-question-sudoku-solver.html