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…

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…

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…

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…

[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…

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…

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…