[LeetCode] Sparse Matrix Multiplication

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You may assume that A's column number is equal to B's row number.

The solution is much more easier than we may have imagined. Take a look at this solution. But note that it is buggy as pointed out in the first comment (oh, how could the test cases be so weak)! I have rewritten it as follows.

Problem Description:

Example:

Given two sparse matrices A and B, return the result of AB.