Suppose you have to evaluate an expression like ABCDE where A,B,C,D and E are matrices. Since matrix multiplication is associative, the order in which multiplications are performed is arbitrary. However, the number of elementary multiplications neede…

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…

这个题思路没有任何问题,但还是做了近三个小时,其中2个多小时调试 得到的经验有以下几点: 一定学会调试,掌握输出中间量的技巧,加强gdb调试的学习 有时候代码不对,得到的结果却是对的(之后总结以下常见错误) 能用结构体,就别用数组,容易出错(暂时还不知道为什么)=>现在知道申请的数组空间在运行期间被释放,除非用malloc去申请数组 代码要规范,空格该有就要有 有些不规范表达式,不同编译器出现不同结果,注意应避免使用这类语句 像这道题主要坑在了第三点上,以后要注意避免 以下是AC代码 第一次完成…

442 Matrix Chain MultiplicationSuppose you have to evaluate an expression like A*B*C*D*E where A,B,C,D and E are matrices.Since matrix multiplication is associative, the order in which multiplications are performed is arbitrary.However, the number of…

意甲冠军  由于矩阵乘法计算链表达的数量,需要的计算  后的电流等于行的矩阵的矩阵的列数  他们乘足够的人才  非法输出error 输入是严格合法的  即使仅仅有两个相乘也会用括号括起来  并且括号中最多有两个 那么就非常easy了 遇到字母直接入栈  遇到反括号计算后入栈  然后就得到结果了 #include<cstdio> #include<cctype> #include<cstring> using namespace std; const int N = 10…

Matrix Chain Multiplication Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 834    Accepted Submission(s): 570 Problem DescriptionMatrix multiplication problem is a typical example of dynamical…

// UVa442 Matrix Chain Multiplication // 题意:输入n个矩阵的维度和一些矩阵链乘表达式,输出乘法的次数.假定A和m*n的,B是n*p的,那么AB是m*p的,乘法次数为m*n*p // 算法:用一个栈.遇到字母时入栈,右括号时出栈并计算,然后结果入栈.因为输入保证合法,括号无序入栈   #include<cstdio> #include<stack> #include<iostream> #include<string>…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1082 Matrix Chain Multiplication Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 1382    Accepted Submission(s): 905 Problem Description Matrix mul…

Description   Matrix Chain Multiplication  Matrix Chain Multiplication  Suppose you have to evaluate an expression like A*B*C*D*E where A,B,C,D and E are matrices. Since matrix multiplication is associative, the order in which multiplications are per…

题意: 给出一个矩阵表达式,计算总的乘法次数. 分析: 基本的数学知识:一个m×n的矩阵A和n×s的矩阵B,计算AB的乘法次数为m×n×s.只有A的列数和B的行数相等时,两个矩阵才能进行乘法运算. 表达式的处理:可以用一个栈来存储,遇到字母入栈,遇到右括号将栈顶两个元素出栈,然后将乘积入栈. #include <cstdio> #include <cstring> ; int n; ]; struct Matrix { int n, m; Matrix(, ):n(n), m(m)…