Pity that eval is forbidden - I had quite an elegant solution using it.
Find the longest sequence of 1's in a binary sequence.
Test if a Number is a Palindrome without using any String Operations
Roll the Dice!
Convert Two Character String into a Binary Vector
Only once: cleaning up your columns
Order of things - 3
Insert certain elements into a vector.
Robust alignment of coordinate system
Wayfinding 3 - passed areas
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