Same algorithm in Rust finds 2172315626468283465 in about 3 seconds on my M1 Pro.

    $ time cargo run --release
        Finished `release` profile [optimized] target(s) in 0.02s
         Running `target/release/p45`
    0
    1
    40755
    1533776805
    57722156241751
    2172315626468283465
    cargo run --release  2.95s user 0.04s system 98% cpu 3.029 total

Runs on the Rust Playground too: https://play.rust-lang.org/?version=stable&mode=release&edit...

The mask hides the whole sentence except the answer. Lol.

Google must have some awful PMs and designers. The worst UX decision I have seen recently is AI auto-dubbing all youtube videos by default with no way to disable this behavior globally. How could you miss that people can be fluent in multiple languages and if I click on a video in a foreign language, I most likely want the original soundtrack? Clearly, the intention was to boost some metric “X users are using this feature” with no regard for the actual user.

When I got to "There are hells on earth and Dubai is one" I scrolled back, thinking I had missed where they described that. Either it was left out of this book excerpt or the author has a prior revulsion at people being employed for tourism that makes their examples seem self-evidently awful to them only.

> You don't need a computer science background to participate - just a little programming knowledge and some problem solving skills will get you pretty far.

The use of “pretty far” gives them a bit of an out, but I think this statement is a little disingenuous. Last year, at least, a bunch of the problems needed fairly sophisticated algorithms to find the solution in a reasonable amount of time.

To me, a little programming knowledge is what somebody who is six weeks into their introduction to programming class has. They know variables, loops, lists, and maybe associative arrays.