These two files were written by SeanPeng08 in 6/2024 TW The first sudoku generator generates the sudoku with completely random probability, so there are tons of bugs inside the first generator without sorting out, and the sudokus it generates may not have a valid solution. The second sudoku generator can ensure the solution of suudoku exist by calculating the solution in advance. Each of the sudokugenerators might generates some sudokus with multiple solutions.