The newly introduced difficulty measure relies on two factors: member interactions with the problems and the fastest solvers data. As we continue to monitor and improve the usefulness of the difficulty metric, we are making a small change shortly that will introduce a third measure: the team's rating of the difficulty of the problem during development. The overall difficulty metric will still lean more on the dynamic elements of the current ranking system, but we are confident that this final measure will help to stabilise the data and give each new problem a better starting point.
The strength of correlation with the current ranks and the new system is very high, so you will not see significant changes, but there will be the occasional problem that might suddenly change levels. Although this might be a little frustrating in the short term, we are hopeful that it provides a better and more meaningful measure in the long term to help guide you on your journey through the problem set.
The update has now been completed (17 April 2026)
Update to the Ranking Algorithm (April 2026)
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euler
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