UVA - 442 Matrix Chain Multiplication 双端队列 题目大意:给出n个矩阵和表达式,问该表达式是否正确,如果计算正确,输出计算了多少次 解题思路:双端队列,遇到右括号时弹出后面的两个矩阵进行乘法,相乘时要注意顺序,是第二个出队列的乘上第一个出队列的。 #include<cstdio> #include<algorithm> #include<deque> #...
1.矩阵链乘 Matrix Chain Multiplication01-142.破损的键盘 Broken Keyboard (a.k.a. Beiju Text)01-143.素数环03-07 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 ...
// 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>usingnamespacestd;structMatrix {inta, b; Matrix(inta=0,intb=0):a(a),b(b) {} } m[26]; stack<Matrix>s;intmain() {int...
Adding whitespace in a Javascript document.write So I'm currently creating a dynamic table using some JavaScript and a set of objects. I need to add in some white space between the two but one space isn't enough, I need to have it almost tabbed out... How...
uva442 Matrix Chain Multiplication 出栈#include入栈文章分类后端开发 #include<cstdio> #include<stack> #include<iostream> #include<string> usingnamespacestd; structMatrix{ inta,b; Matrix(inta=0,intb=0):a(a),b(b) {} }m[26];//定义了一个结构体变量,并把两个成员都初始化为0...
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...
#include<bits/stdc++.h> using namespace std; int main(){ int n,a,b; scanf("%d%*c",&n);//%*c用来吸收换行符 map<char,pair<int,int>>matrix;//存储矩阵及其行列维度 for(int i=0;i<n;++i){ char c; scanf("%c%d%d%*c",&c,&a,&b); matrix[c]={a,b}; } string line; wh...
Ja**ne 上传17KB 文件格式 pdf c cat IN #includepch.h #include #include #include #include using namespace std; struct Matrix { int a, b; Matrix(int a = 0,int b=0):a(a),b(b){} }m[26]; stack s; int main() { int n;...
Matrix-chainmultiplication 问题描述 Input:{p0, p1 ,... , p n}. a chain {A1, A2,..., A n} of n matrices for i = 1, 2,...,n , matrix A i has dimension p i-1 * p i.值得注意的该问题的输⼊定义及其巧妙，不仅定义了矩阵的⾏以及列，还说明了它们是可乘的。Output:fully ...
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 ...