摘要： 原题链接在此：https://leetcode.com/problems/sudoku-solver/ 题目： Write a program to solve a Sudoku puzzle by filling the empty cells. A sudoku solution must sa 阅读全文

摘要： 原题链接在此：https://leetcode.com/problems/n-queens/ 题目： The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens 阅读全文

摘要： Final is a Keyword, final can be used in three different ways: final variable final method final class final variable 基本上就是 constant，一旦被赋值，就不能被变更；如果在c 阅读全文