［抄题］: 给定两个 稀疏矩阵 A 和 B,返回AB的结果.您可以假设A的列数等于B的行数. [暴力解法]: 时间分析: 空间分析: ［思维问题］: ［一句话思路］: 如果为零则不相乘,优化常数的复杂度. ［输入量］:空: 正常情况:特大:特小:程序里处理到的特殊情况:异常情况(不合法不合理的输入): ［画图］: ［一刷］: 是ans[i][j] 元素变化来进行具体的加减操作,而不是无参数的ans[][] 用来声明,搞混了 ［二刷］: ［三刷］: ［四刷］: ［五刷］: [五分钟肉眼debug的…

Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number. Example: A = [ [ 1, 0, 0], [-1, 0, 3] ] B = [ [ 7, 0, 0 ], [ 0, 0, 0 ], [ 0, 0, 1 ] ] | 1 0 0 | | 7 0 0 | | 7 0 0 | AB = | -…

Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number. Example: Input: A = [ [ 1, 0, 0], [-1, 0, 3] ] B = [ [ 7, 0, 0 ], [ 0, 0, 0 ], [ 0, 0, 1 ] ] Output: | 1 0 0 | | 7 0 0 | | 7…

题目: Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number. Example: A = [ [ 1, 0, 0], [-1, 0, 3] ] B = [ [ 7, 0, 0 ], [ 0, 0, 0 ], [ 0, 0, 1 ] ] | 1 0 0 | | 7 0 0 | | 7 0 0 | AB =…

参数的设置:spparms() spparms('spumoni', 3);:Set sparse monitor flag to obtain diagnostic output 1. 创建稀疏矩阵 A = sparse(M, N); % 默认得到的是全 0 稀疏矩阵: 2. spdiags 提取稀疏矩阵的"对角线" [B,d] = spdiags(A) % d 表示的是非零对角线所对应的编号 A = spdiags(B,d,m,n) 3. 稀疏单位矩阵 speye(N)…

Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number. Example: A = [ [ 1, 0, 0], [-1, 0, 3] ] B = [ [ 7, 0, 0 ], [ 0, 0, 0 ], [ 0, 0, 1 ] ] | 1 0 0 | | 7 0 0 | | 7 0 0 | AB = | -…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 暴力 科学计算库numpy 日期 题目地址:https://leetcode-cn.com/problems/sparse-matrix-multiplication/ 题目描述 Given two sparse matrices A and B, return the result of AB. You may assume that A's col…

Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number. Example: A = [ [ 1, 0, 0], [-1, 0, 3] ] B = [ [ 7, 0, 0 ], [ 0, 0, 0 ], [ 0, 0, 1 ] ] | 1 0 0 | | 7 0 0 | | 7 0 0 | AB = | -…

Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number. Example: A = [ [ 1, 0, 0], [-1, 0, 3] ] B = [ [ 7, 0, 0 ], [ 0, 0, 0 ], [ 0, 0, 1 ] ] | 1 0 0 | | 7 0 0 | | 7 0 0 | AB = | -…

Problem Description: Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number. Example: A = [ [ 1, 0, 0], [-1, 0, 3] ] B = [ [ 7, 0, 0 ], [ 0, 0, 0 ], [ 0, 0, 1 ] ] | 1 0 0 | | 7 0 0…