You're *very* close with this one. Remember that r is input as a double, not a string.
Test for balanced parentheses
Knight's Tour Checker
Find Rotated Substring
Getting logical indexes
Operate on matrices of unequal, yet similar, size
Breaking Out of the Matrix
The cake is a lie...
Circular Primes (based on Project Euler, problem 35)
Some Assembly Required
High Precision Square Root (Inspired by Project Euler 80)
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