Get the length of a given vector
Given a 4x4 matrix, swap the two middle columns
Is this triangle right-angled?
Pernicious Anniversary Problem
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Don't be mean. Be nice!
Two fractions, one sum
Now 20% off!
Miles to go before I sleep
Pseudo Square Root (Inspired by Project Euler 266)
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