A sparse matrix can be represented as a sequence of rows, each of which is a sequence of (column-number, value) pairs of the nonzero values in the row. 1publicclassSolution {2publicint[][] multiply(int[][] A,int[][] B) {3if(A ==null|| A[0] ==null|| B ==null|| B[0]...
给2个稀疏矩阵,返回矩阵相乘的结果。 在数值分析中,稀疏矩阵(Sparse matrix),是其元素大部分为零的矩阵。反之,如果大部分元素都非零,则这个矩阵是稠密的。在科学与工程领域中求解线性模型时经常出现大型的稀疏矩阵。在使用计算机存储和操作稀疏矩阵时,经常需要修改标准算法以利用矩阵的稀疏结构。由于其自身的稀疏特性,...
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 column number is equal to B’s row number. Example: Input: A = [ [ 1, 0, 0], [-1, 0, 3...
A sparse matrix can be represented as a sequence of rows, each of which is a sequence of (column-number, value) pairs of the nonzero values in the row. 1publicclassSolution {2publicint[][] multiply(int[][] A,int[][] B) {3if(A ==null|| A[0] ==null|| B ==null|| B[0]...
【Leetcode】311. Sparse Matrix Multiplication 1 1 交换了上述两行,时间可以大大减少,外面两个loop只遍历A的,遇到元素为0的,直接跳过遍历B 2 遇到A中为0的就跳过,这是因为它不会对结果矩阵中的任何一个元素提供增量
311. Sparse Matrix Multiplication https://leetcode.com/problems/sparse-matrix-multiplication/description/ image.png 这道题首先会想到,就用传统的矩阵乘法人手算的步骤来模拟就可以解。但是没利用到稀疏矩阵的条件,所以我们看下稀疏矩阵的特性是0多,那有没有方法,0 可以不用计算呢?
题目描述 题解 题解 提交记录 提交记录 代码 9 1 2 3 4 › [[1,0,0],[-1,0,3]] [[7,0,0],[0,0,0],[0,0,1]] [[0]] [[0]] Source 该题目是 Plus 会员专享题 感谢使用力扣!您需要升级为 Plus 会员来解锁该题目 升级Plus 会员...
https://github.com/grandyang/leetcode/issues/311 类似题目: Dot Product of Two Sparse Vectors 参考资料: https://leetcode.com/problems/sparse-matrix-multiplication/ https://leetcode.com/discuss/77235/ac-soluiton-code https://leetcode.com/discuss/71912/easiest-java-solution ...
1publicclassSolution {2publicint[,] Multiply(int[,] A,int[,] B) {3introws = A.GetLength(0), cols = A.GetLength(1), colsB = B.GetLength(1);45varresult =newint[rows, colsB];67//since it's a sparse matrix, we only want to know rows/cols with a non-zero element8varnonZero...
Leetcode:SparseMatrix Multiplication Given twosparsematrices 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],... Leetcode Matrix HashMap i++ ide