README_EN.md

311. Sparse Matrix Multiplication

中文文档

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:

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 0 0 |
AB = | -1 0 3 | x | 0 0 0 | = | -7 0 3 |
                  | 0 0 1 |

 

Constraints:

• 1 <= A.length, B.length <= 100
• 1 <= A[i].length, B[i].length <= 100
• -100 <= A[i][j], B[i][j] <= 100

Solutions

Python3

Java

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