[ken]

> Check out the statistics for how many people completed each problem in 2018

I suspect you'd see a dropoff like this regardless of whether the problems get more difficult or not. Going to the gym doesn't get any harder in February but they see the same effect.

[bhrgunatha]

The scatterlpots [1] of the time taken for the leaderboard (top 100) to finish part 1 (silver) and part 2 (gold) are a better indicator of difficulty.

I'd like to see a plot of average (median or mode) to finish each part but only the site has all that information.

[1] http://www.maurits.vdschee.nl/scatterplot/

[sa46]

Those box plots use horizontal jitter within individual boxes to better show overlapping points. That's a neat technique I haven't seen before.

[maxnoe]

seaborn: https://seaborn.pydata.org/generated/seaborn.swarmplot.html#...

[teraflop]

True; I would be interested in seeing the number of logged-in users who viewed and/or attempted each problem.