There are numbers next to the names on the leaderboard (eg the 22 in 1) 22 * yfzhe). What do those mean?

Something like scores?

Those are the scores. The first person to complete a puzzle gets 2*num_entrants points, the next person gets 2 less, and so on. If you only complete half the puzzle you get half the points. Scores are recalculated when people enter/leave the leaderboard.

(def FILE "../data/1.txt") (def data (~>> FILE file->lines (map string->number))) ;; ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ;; Solve (fn (step n) (~> n (quotient _ 3) (- 2))) (fn (score n) (apply + (unfold negative? identity step (step n)))) (def A (~>> data (map step) (apply +))) (def B (~>> data (map score) (apply +)))

If you are using threading you can remove some of those _ by using ~>>

ohh thanks

And you can replace (* 1/3) floor with (quotient _ 3).

The difficulty increased a bit from yesterday :stuck_out_tongue:

and increased from last year, IMHO

Here are the total completion stats: https://adventofcode.com/2019/stats