You have to drive home, and that with an Uber cab. You have $20 in your pocket and you want to make the most out of it, by choosing the best ride for you. There are 5 options from least to most expensive, UberX, UberXL, UberPlus, UberBlack, UberSUV. Challenge Knowing the length of your ride in mi...

Your task is to save to write exactly 3 million lines of valid HTML. By "valid" I mean conforming to some established HTML specification, not just something that a browser will render. The specific content of the HTML and length of each line do not matter (as long as it's valid), and you can eith...

Here's an easy one, with just enough complexity to make golfing non-trivial. Input A list of non-negative numbers representing people waiting in line for Thanksgiving dessert. The first (leftmost) number is first in line, and the list can contain repeats (think of each number as a person's firs...

Multiply or Divide by n Here's a simple challenge. Given a positive integer \$n\$, output \$A076039(n)\$ from the OEIS. That is, start with \$a(1)=1\$. Then for \$n>1\$: $$a(n)=\left\{ \begin{array}{ll} n\cdot a(n-1), & \text{if } n>a(n-1) \\ \lfloor a(n-1)/n \rfloor, & \text{otherwise.}\end{arr...