Which doors are open?
Get the area codes from a list of phone numbers
Reverse the Words (not letters) of a String
find the roots of a quadratic equation
Divide by 4
Parse me a Lisp
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Test if a Number is a Palindrome without using any String Operations
Project Euler: Problem 16, Sums of Digits of Powers of Two
Set a Soroban Abacus
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