矩阵链乘(Matrix Chain Multiplication) 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。如果乘法无法进行,则输出error。假定A是m*n矩阵,B是n*p矩阵,那么A*B是m*p矩阵,乘法次数为m*n*p。如果A的列数不等于B的行数,则乘法无法进行。 例如,A是50*10的,B是10*20的,C是20*5的,则(A(BC))的乘法...
} 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 performed is arbitrary. However, the number of elementary multiplications needed strongly ...
UVA 442 - Matrix Chain Multiplication 题目大意:输入n个x*y的矩阵,如果A矩阵为m*n,B矩阵为n*p。两个矩阵相乘的结果为m*p矩阵,需要乘m*n*p次。如果不满足则输出error。输出乘法总次数。C矩阵为p*q的话,则(AB)C的乘法次数为m*n*p+m*p*q。输入需要算乘法次数的式子。 解题思路:利用栈的基础进行求解。...
int n, x, y; char t, in[100]; gets(in); sscanf(in,"%d",&n); for(int i = 0; i < n; i++) { gets(in); sscanf(in,"%c%d%d", &t, &x, &y); Map[t] = Matrix(x,y); } while(gets(str)) { solve(); } return 0; } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10....
[题目链接] 思路 核心问题是正确处理多个括号内矩阵的运算顺序,使用stack将矩阵存入,每当遇见字符 ' ) ' 时对栈顶的两个元素进行操作,便可以正确处理顺序。另使用结构...
importsys# 存储矩阵,每个矩阵是一个三元组matrixs=[]deffunc(matrix_express):iflen(matrix_express)==0:return0# 用于计算表达式的栈stack=[]# 乘法次数time_count=0forsymbolinmatrix_express:ifsymbol=='(':stack.append(symbol)elifsymbol==')':matrix_b=stack.pop()matrix_a=stack.pop()# 弹出(stack...
网络释义 1. 矩阵链相乘 www.nexoncn.com|基于2个网页 2. 矩阵相乘 ...ecutive Sum) 、最大子矩阵、最大矩形、矩阵相乘(Matrix-Chain Multiplication) 、拿石头、旅行推销员问题 (Traveling Sales… web.fg.tp.edu.tw|基于 1 个网页 3. 或矩阵连乘问题 ...
Matrix chain multiplication is one of the classic optimization problems in computer science. For a given sequence \\(A_{1}\\), \\(A_{2},\\ldots ,A_{n}\\) of matrices, we need to compute the product of these matrices using the minimum number of scalar multiplications on a single ...
An Algorithm of solving the minimal calculating times of matrix chain-multiplication; 求解矩阵连乘最小乘法次数的一个自底向上算法 更多例句>> 2) transfer matrix 换乘矩阵 1. Because there are too much information to rapid calculation during transfer matrix development using urban bus IC data,Excel...
简介:UVA442 矩阵链乘 Matrix Chain Multiplication 题目描述 思路:首先要明白以下几点: 什么是矩阵乘法?(大概学过线代的都知道) 什么矩阵不可乘? A a*b B c*d 当 b = c时,两个矩阵可以相乘,同时结果为 C a*d 矩阵乘法的次数如何计算: 可以相乘的情况下 次数 = a*b*d (a*c*d也行) 这可以自己推...