Leetcode Problem 311. Sparse Matrix Multiplication

311. Sparse Matrix Multiplication

Leetcode Solutions

Approach: Naive Iteration

  1. Initialize a result matrix ans with dimensions m x n, filled with zeros.
  2. Iterate over each row i of mat1.
  3. For each row i, iterate over each column j of mat2.
  4. For each pair (i, j), compute the dot product of the i-th row of mat1 and the j-th column of mat2: a. Initialize a sum variable to 0. b. Iterate over each element k in the i-th row of mat1. c. Multiply mat1[i][k] by mat2[k][j] and add the result to the sum variable. d. After iterating through all elements, assign the sum to ans[i][j].
  5. Return the result matrix ans.
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Approach: List of Lists for Sparse Matrices

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