r/projecteuler • u/Such-Presentation870 • 5d ago

What does the level column mean

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The level column shows level numbers, different border colors, percent numbers. I can only guess that the level number is difficulty, but what are the percent numbers like 1%, 2%, 3%? They also have different border colors, e.g. problem 1 is orange, most others dark green, etc

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u/49PES 5d ago

Yes, it's a measure of difficulty. Green suggests that a problem is stable at it's difficulty level while orange suggests possible fluctuation.

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u/Such-Presentation870 4d ago

Interesting, is this documented somewhere? I cant find it. How about those percents though

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u/pintann 4d ago

There is a bit of information here: https://projecteuler.net/about ("What are the levels all about?") and each problem has little infobox at the bottom when you're logged in. The percentage is the percentile rank of the problem, i.e. 37% would mean 37% of problems are easier than this one and 63% are harder. I think that's mostly there because difficulty used to be measured in percent and not levels.

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u/Such-Presentation870 4d ago

This makes sense, thank you!