栈的练习,如此水题竟然做了两个小时... 题意:给出矩阵大小和矩阵的运算顺序,判断能否相乘并求运算量. 我的算法很简单:比如(((((DE)F)G)H)I),遇到 (就cnt累计加一,字母入栈,遇到)减一,并出栈两个矩阵计算运算量,将计算后的矩阵压入栈.当cnt等于0时就输出运算量. 难点是当不能运算后的处理. 卡那么就其实主要是细节问题,最大的坑是里面退栈时倒着退出,没注意到结果每次计算都判断为不能计算... AC代码: #include <iostream> #include <cs…

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…

// 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>…

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…

#include<cstdio>#include<cstring> #include<stack> #include<algorithm> #include<iostream> using namespace std; struct matrix { int a,b; matrix(,):a(a),b(b) {}//结构体构造函数赋值 }m[]; stack<matrix>s; int main() { int n; char A;…

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 performed is arbitrary. However, the number of elementary multiplications n…

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…

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…

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…

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…