题目链接:option=com_onlinejudge&Itemid=8&page=show_problem&problem=1253">10312 - Expression Bracketing 题意:有n个x,要求分括号,推断非二叉表达式的个数. 思路:二叉表达式的计算方法就等于是Catalan数的,那么仅仅要计算出总数,用总数减去二叉表达式个数.得到的就是非二叉表达式的个数. 那么计算方法是什么呢. 看题目中的图,对于n = 4的情况,能够分为这几种情况来讨论…

Description Problem A Expression Bracketing Input: standard input Output: standard output Time Limit: 1 second Memory Limit: 32 MB Inthis problem you will have to find in how many ways n letters can be bracketed so that the bracketing is non-binarybr…

题目来源:https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=3&page=show_problem&problem=48 Tree Summing  Background LISP was one of the earliest high-level programming languages and, with FORTRAN, is one of the olde…

题目来源:https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=3&page=show_problem&problem=44  Maximum Sum  Background A problem that is simple to solve in one dimension is often much more difficult to solve in more th…

Matrix Chain Multiplication Time Limit:3000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Submit Status Practice UVA 442 Appoint description:  System Crawler  (2015-08-25) Description   Suppose you have to evaluate an expression like A*B*C*D…

uva 10718  Bit Mask  (位运算) Problem A Bit Mask Time Limit 1 Second In bit-wise expression, mask is a common term. You can get a certain bit-pattern using mask. For example, if you want to make first 4 bits of a 32-bit number zero, you can use 0xFFFFFF…

uva 465 - Overflow  Overflow  Write a program that reads an expression consisting of two non-negative integer and an operator. Determine if either integer or the result of the expression is too large to be represented as a ``normal'' signed integer (…

[来源]https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=2266 此题比较简单,主要工作在于字符串的分割,怎么把代码写得漂亮点才是重点,可读性很重要.利用函数atof(stdlib.h)要比一位位去拼数字要方便点. #include <iostream> #include <stdio.h> #include <…

上次那个大数开方的高精度的题,UVa113 Power of Cryptography,直接两个double变量,然后pow(x, 1 / n)就A过去了. 怎么感觉UVa上高精度的题测试数据不给力啊... 话说回来,我写了100+行代码,WA了,后来考虑到要忽略前导0,又WA了,实在不知道哪出问题了.  Overflow  Write a program that reads an expression consisting of twonon-negative integer and an…

Tree Summing Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 8132   Accepted: 1949 Description LISP was one of the earliest high-level programming languages and, with FORTRAN, is one of the oldest languages currently being used. Lists, w…