Project Euler: Problem 6, Natural numbers, squares and sums.
Make a run-length companion vector
Change the sign of even index entries of the reversed vector
Solving Quadratic Equations (Version 1)
Multiply by 3
Remove the polynomials that have positive real elements of their roots.
Sums with Excluded Digits
Connect Four Win Checker
Word Counting and Indexing
Summing Digits within Text
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