摘要： https://leetcode.com/problems/reverse-integer/description/ Given a 32-bit signed integer, reverse digits of an integer. Example 1: Example 2: Example 阅读全文

摘要： https://leetcode.com/problems/first-unique-character-in-a-string/description/ Given a string, find the first non-repeating character in it and return 阅读全文

摘要： https://leetcode.com/problems/reverse-string/description/ Write a function that takes a string as input and returns the string reversed. Example:Given 阅读全文

摘要： https://leetcode.com/problems/remove-duplicates-from-sorted-array/description/ Given a sorted array, remove the duplicates in-place such that each ele 阅读全文

摘要： https://leetcode.com/problems/group-anagrams/description/ Given an array of strings, group anagrams together. For example, given: ["eat", "tea", "tan" 阅读全文

摘要： https://leetcode.com/problems/valid-anagram/description/ Given two strings s and t, write a function to determine if t is an anagram of s. For example 阅读全文

摘要： https://leetcode.com/problems/power-of-three/description/ Given an integer, write a function to determine if it is a power of three. Follow up:Could y 阅读全文

摘要： https://leetcode.com/problems/power-of-two/description/ Given an integer, write a function to determine if it is a power of two. 简单数学题，位运算 2的幂在2进制中只有1 阅读全文

摘要： 设计模式 | 菜鸟教程 http://www.runoob.com/design-pattern/design-pattern-tutorial.html 四位作者合称 GOF（四人帮，全拼 Gang of Four）。他们所提出的设计模式主要是基于以下的面向对象设计原则。总共有 23 种设计模式。 阅读全文

摘要： 编译器的工作过程 http://www.runoob.com/w3cnote/working-process-of-the-compiler.html 第一步 配置（configure） 第二步 确定标准库和头文件的位置 第三步 确定依赖关系 第四步 头文件的预编译（precompilation） 阅读全文