I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Which doors are open?
It dseon't mettar waht oedrr the lrettes in a wrod are.
Replace Vector Elements
Split a string into chunks of specified length
Number of digits in an integer
Test if a Number is a Palindrome without using any String Operations
Give the Shortest Path Through The Maze
N-Dimensional Array Slice
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