Asif, Thanks for another nice problem.
I think the description would be improved if it said the "red shaded portion", because there are two shaded portions in the drawing.
Select every other element of a vector
Replace NaNs with the number that appears to its left in the row.
Arrange vector in ascending order
Doubling elements in a vector
Combinatorics - 01
generate the matrix
Sky full of stars - 01
Generate Golomb's sequence
Most Frequent Word - 01
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