数独游戏，利用回溯法，可进行数独求解，生成，简单无图形化源代码(Sudoku , originally called Number Place, is a logic-based, combinatorial number-placement puzzle.)

回溯法求解最大团问题，时间复杂度为O(n*2^n)。(The backtracking method is used to solve the maximum clique problem with a time complexity of O (n*2^n).)