[LeetCode]592. Fraction Addition and Subtraction 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.me/ 题目地址:https://leetcode.com/problems/fraction-addition-and-subtraction/description/ 题目描述: Given a string representi…

Given a string representing an expression of fraction addition and subtraction, you need to return the calculation result in string format. The final result should be irreducible fraction. If your final result is an integer, say 2, you need to change…

Problem statement: Given a string representing an expression of fraction addition and subtraction, you need to return the calculation result in string format. The final result should be irreducible fraction. If your final result is an integer, say 2,…

Given a string representing an expression of fraction addition and subtraction, you need to return the calculation result in string format. The final result should be irreducible fraction. If your final result is an integer, say 2, you need to change…

题目如下: 解题思路:本题考察的是分数的加减法.小学时候就学过,分数的加减法是先求两个分母的最小公倍数,然后分子分别乘以最小公倍数与自己分母的商,相加后约分即可.所以,本题只要按+,-两个符号分割输入字符串,就可以得到所有的分数列表,做加减操作即可.考虑到第一个分数是负数的情况,我在代码中加入了一个判断,如果表达式第一个字符是负数,给表达式加上'0/1'的前缀,既不影响结果,又简化了代码. 代码如下: class Solution(object): def fractionAddition(se…

Given a string representing an expression of fraction addition and subtraction, you need to return the calculation result in string format. The final result should be irreducible fraction. If your final result is an integer, say 2, you need to change…

Given a string representing an expression of fraction addition and subtraction, you need to return the calculation result in string format. The final result should be irreducible fraction. If your final result is an integer, say 2, you need to change…

Given a string representing an expression of fraction addition and subtraction, you need to return the calculation result in string format. The final result should be irreducible fraction. If your final result is an integer, say 2, you need to change…

题目描述 Description 加减法是计算中的基础运算,虽然规则简单,但是位数太多了,也难免会出错.现在的问题是:给定任意位数(不超过1000位)的加减法算式,请给出正确结果.为提高速度,保证给定运算的结果均为正整数.  输入输出格式 Input/output 输入格式:一行:一个加法或减法的表达式输出格式:一个正整数,表示计算的结果(不可以有前导0)  输入输出样例 Sample input/output 样例测试点#1 输入样例: 12345678+111 输出样例: 123456789…

传送门 题目大意 给定一个加减法的表达式,让你任意的添加合法的括号对,使的表达式最大. 题解 考虑到任意左括号一定加在减号右边,那么对于第一个左括号,与该左括号相邻的只含有加号的子序列的贡献一定为负,但是之后的所有数对答案的贡献都可以达到这些数的绝对值,即对于第一个左括号,钦定其对应的右括号在整个表达式的最后,这一段表达式内除去前缀的加法表达式外,对于所有的连续的加法外加一个括号,可以构造形如$$A-(x+x-(x+x+x)-x-x-(x+x))$$使得贡献全部为正但是题目中还有每个括号必须与一…

http://arc066.contest.atcoder.jp/tasks/arc066_c?lang=en 这类题目是我最怕的,没有什么算法,但是却很难想, 这题的题解是这样的,观察到,在+号里面添加括号是没用的, 那么看看减号,任意两个相邻减号, 比如1 - 20 + 8 - 13 - 5 + 6 + 7 - 8 可以变成1 - (20 + 8 - 13) + 5 + 6 + 7 + 8 为什么后面的可以全部都变成正数呢? 因为可以这样变,1 - (20 + 8 - 13 - (5 + 6…

Time limit : 2sec / Memory limit : 256MB Score : 900 points Problem Statement Joisino has a formula consisting of N terms: A1 op1 A2 … opN−1 AN. Here, Ai is an integer, and opi is an binary operator either + or -. Because Joisino loves large numbers,…

题目链接 题目大意 给定一个只含加减和数字的表达式,在其中添加括号,使其值最大. 解题思路 显然,只有减号后面的括号会使其中表达式的值取反. 然后只有已经有左括号时才能加入右括号. 所以用\(f_0\)表示没有左括号,用\(f_1\)表示当前是负区间,\(f_1\)表示当前是正区间. 当当前的数是负的时,可以加入左括号转移.当存在左括号时,可以加入右括号转移. 代码 #include<iostream> #include<cstdio> #include<cstdlib>…

突然很想刷刷题,LeetCode是一个不错的选择,忽略了输入输出,更好的突出了算法,省去了不少时间. dalao们发现了任何错误,或是代码无法通过,或是有更好的解法,或是有任何疑问和建议的话,可以在对应的随笔下面评论区留言,我会及时处理,在此谢过了. 过程或许会很漫长,也很痛苦,慢慢来吧. 编号 题名 过题率 难度 1 Two Sum 0.376 Easy 2 Add Two Numbers 0.285 Medium 3 Longest Substring Without Repeating C…

All LeetCode Questions List(Part of Answers, still updating) 题目汇总及部分答案(持续更新中) Leetcode problems classified by company 题目按公司分类(Last updated: October 2, 2017) .   Top Interview Questions # Title Difficulty Acceptance 1 Two Sum Medium 17.70% 2 Add Two N…

源代码地址:https://github.com/hopebo/hopelee 语言:C++ 517. Super Washing Machines You have n super washing machines on a line. Initially, each washing machine has some dresses or is empty. For each move, you could choose any m (1 ≤ m ≤ n) washing machines,…

终于将LeetCode的免费题刷完了,真是漫长的第一遍啊,估计很多题都忘的差不多了,这次开个题目汇总贴,并附上每道题目的解题连接,方便之后查阅吧~ 如果各位看官们,大神们发现了任何错误,或是代码无法通过OJ,或是有更好的解法,或是有任何疑问,意见和建议的话,请一定要在对应的帖子下面评论区留言告知博主啊(如果不方便注册博客园的话,可以下载下文提到的APP,在Feedback中给博主发邮件交流哈),同时也请大家踊跃地,大量地,盲目地提供各个题目的follow up一起讨论哈,多谢多谢,祝大家刷得愉快…

请点击页面左上角 -> Fork me on Github 或直接访问本项目Github地址:LeetCode Solution by Swift    说明:题目中含有$符号则为付费题目. 如:[Swift]LeetCode156.二叉树的上下颠倒 $ Binary Tree Upside Down 请下拉滚动条查看最新 Weekly Contest!!! Swift LeetCode 目录 | Catalog 序        号 题名Title 难度     Difficulty  两数之…

[2]Add Two Numbers (2018年12月23日,review) 链表的高精度加法. 题解:链表专题:https://www.cnblogs.com/zhangwanying/p/9797184.html [7]Reverse Integer (2018年12月23日, review) 给了一个32位的整数,返回它的reverse后的整数.如果reverse后的数超过了整数的范围,就返回 0. Example 1: Input: 123 Output: 321 Example 2:…

链接:https://leetcode.com/contest/leetcode-weekly-contest-33/ A.Longest Harmonious Subsequence 思路:hash加查找 class Solution { public: int findLHS(vector<int>& nums) { if (nums.empty()) ; ; int len = nums.size(); unordered_map<int, int> hash(len…

Solve a given equation and return the value of x in the form of string "x=#value". The equation contains only '+', '-' operation, the variable x and its coefficient. If there is no solution for the equation, return "No solution". If th…

原文地址 Floating point numbers — Sand or dirt Floating point numbers are like piles of sand; every time you move them around, you lose a little sand and pick up a little dirt. — Brian Kernighan and P.J. Plauger Real numbers are a very important part of…

转:http://phrack.org/papers/attacking_javascript_engines.html Title : Attacking JavaScript Engines: A case study of JavaScriptCore and CVE-2016-4622 Author : saelo Date : October 27, 2016 |=-------------------------------------------------------------…

Java实现分数的四则运算 自己的写法 markdown太久没写格式不会用了--将就着看 Fraction.java package com.lanou; public class Fraction { private int numerator1; //定义属性:分子1 private int denominator1; //定义属性:分母1 private String operator; //定义属性:运算符 private int numerator2; //定义属性:分子2 priva…

About this Course Machine learning is the science of getting computers to act without being explicitly programmed. In the past decade, machine learning has given us self-driving cars, practical speech recognition, effective web search, and a vastly i…

关键字: and且 or 或 not否 del import导入 from import的来源 whilewhile循环 for for循环 if elif else条件结构 break continue global声明全局变量 with as assert断言 pass表示这是空块,eg,创建一个没有内容的类 try异常处理 except catch yield finally break print打印 class类 exec in遍历用,for循环或列表 raise 引发一个异常 is判…

Processor operations mostly involve processing data. This data can be stored in memory and accessed from thereon. However, reading data from and storing data into memory slows down the processor, as it involves complicated processes of sending the da…

题目链接: 传送门 Prime Land Time Limit: 1000MS     Memory Limit: 10000K Description Everybody in the Prime Land is using a prime base number system. In this system, each positive integer x is represented as follows: Let {pi}i=0,1,2,... denote the increasing…

2066. Simple Expression Time limit: 1.0 secondMemory limit: 64 MB You probably know that Alex is a very serious mathematician and he likes to solve serious problems. This is another problem from Alex. You are given three nonnegative integers a, b, c.…

A - Addition and Subtraction Easy Time limit : 2sec / Memory limit : 256MB Score : 100 points Problem Statement Joisino wants to evaluate the formula "A op B". Here, A and B are integers, and the binary operator op is either + or -. Your task is…