solution is incorrect
Not really, we need to determine the first non-zero element in each column, not row.
Test for balanced parentheses
Back to basics 8 - Matrix Diagonals
Side of an equilateral triangle
Find the 9's Complement
Matrix with different incremental runs
Create a matrix X, where each column is a shifted copy of the vector v
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Duplicate each element of a vector.
A quadrant matrix
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