It would be beneficial for the problem if zeros were added to test cases, for example [...,1,2,0,-1,-2,...], [...,1,2,3,0,2,3,...], [...1,2,3,0,0,0,1,2,...], [...,1,2,0,0,-1,-2,...], etc.
Additional test cases have been added and the description slightly modified.
Most nonzero elements in row
Find common elements in matrix rows
Relative ratio of "1" in binary number
construct matrix with identical rows
Matrix multiplication across rows
stem and leaf plot
The Number of Ways
Reshape a Vector
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