1.矩阵链乘 Matrix Chain Multiplication01-14 收起 题目链接: https://www.luogu.com.cn/problem/UVA442题意:给定若干个矩阵表达式,以及涉及到的矩阵的行与列 定义矩阵相乘次数为矩阵1的行数矩阵1的列数(矩阵2的行数)矩阵2的列数 计算每个表达式的矩阵相乘次数(若不满足矩阵乘法规律输出error)思路...
For example, let A be a 50*10 matrix, B a 10*20 matrix and C a 20*5 matrix. There are two different strategies to compute A*B*C, namely (A*B)*C and A*(B*C). The first one takes 15000 elementary multiplications, but the second one only 3500. Your job is to write a progra...
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...
using namespace std; struct Matrix { int r; int c; char name; }; Matrix m[100]; int main() { int test; char str[100]; scanf("%d", &test); getchar(); for(int i = 0; i < test; i++) { scanf("%c", &(m[i].name)); scanf("%d", &(m[i].r)); scanf("%d", &...
Connect to a local SQL Server db with sequelize Having completed the SQL Server installer, the given connection string is Server=localhost\MSSQLSERVER01;Database=master;Trusted_Connection=True;, which seems like a strange format, and if I try to co... ...
信号链(Signal Chain)芯片 信号链一个系统中信号从输入到输出的路径。具体来说,信号链是对从信号采集(传感器)、信号处理(放大、缩小、滤波)、模数转换(A/D转换器)、到程序处理(微处理器)这一个信号处理过程的总称。由一个一个模块(芯片)组成一整条“链条”。 简单的说,所谓信号链芯片(就是Sensor+ADC+MCU)...
In our example: That’s 460 operations. However, since matrix multiplication is associative, we can compute the chain in a different order: This multiplication order involves 236 operations: The reduction is almost 50%. 2.1. Formulation So, in problems of this type, we have matrices of the ...
Matrix(int a = 0,int b=0):a(a),b(b){} }m[26]; stack s; int main() { int n; cin >> n; for (int i = 0; i > name; int k = name[0] - 'A'; cin >> m[k].a >> m[k].b; } string expr; while (cin >> e ...
For example, let A be a 50*10 matrix, B a 10*20 matrix and C a 20*5 matrix. There are two different strategies to compute A*B*C, namely (A*B)*C and A*(B*C). The first one takes 15000 elementary multiplications, but the second one only 3500. ...
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...