I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Determine if input is odd
Which doors are open?
Find common elements in matrix rows
Find the maximum number of decimal places in a set of numbers
Basic arrays operations.
Give the Shortest Path Through The Maze
Make a 1 hot vector
Project Euler: Problem 16, Sums of Digits of Powers of Two
Parse me a Lisp
Pig Latin to English Translator
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