题目:https://leetcode.com/problems/basic-calculator/ Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parentheses ), the plus + or minus sign -, non-negative integers and empty sp…

题目如下:https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree/ Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowest common ancestor is def…

题目如下:(https://leetcode.com/problems/largest-rectangle-in-histogram/) Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram.          Above is a hist…

题目如下:(https://leetcode.com/problems/find-median-from-data-stream/) Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two middle value. Examples: [2,3,4] …

［抄题］: Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, +, -, *, / operators and empty spaces . The integer division should truncate toward zero. Example 1: Input: "3+2*2&q…

本博客介绍leetcode上的一道不难,但是比较经典的算法题. 题目如下: Implement a basic calculator to evaluate a simple expression string. The expression string may contain open ( and closing parentheses ), the plus + or minus sign -, non-negative integers and empty spaces . You ma…

写在前面的话:关于数据结构与算法讲解的书籍很多,但是用python语言去实现的不是很多,最近有幸看到一本这样的书籍,由Brad Miller and David Ranum编写的<Problem Solving with Algorithms and Data Structures Using Python>,地址为:http://interactivepython.org/runestone/static/pythonds/index.html是英文的,写的不错,里面代码的实现也很详细,很多…

自从工作后就没什么时间更新博客了,最近抽空学了点Python,觉得Python真的是很强大呀.想来在大学中没有学好数据结构和算法,自己的意志力一直不够坚定,这次想好好看一本书,认真把基本的数据结构和算法补一补. Python讲数据结构和算法的书,我想说的是真的太少了!!广泛搜索,中文的图书基本上没有,倒是找到两本外文的: Problem Solving with Algorithms and Data Structures (用Python讲解数据结构与算法) Python Algorithms…

1. 问题描述 Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, +, -, *, / operators and empty spaces . The integer division should truncate toward zero. You may assume that the…

声明:数据结构与算法系列博文参考了<天勤高分笔记>.<王道复习指导>.C语言中文网.非商业用途,仅为学习笔记总结! 第一章<绪论> 一.基本概念及入门常识  ////(一)数据结构的基本概念和术语//// . 数据 数据是信息的载体,是描述客观事物属性的数.字符以及所有能输入到计算机中并被计算机程序识别和处理的符号的集合. . 数据元素 数据元素是数据的基本单位,通常作为一个整体进行考虑和处理.一个数据元素可由若干个数据项组成,数据项是构成数据元素的不可分割的最小单位.…