Hi, I aspire to become candidate master on codeforces. Is solving problems from A2OJ ladders a good idea? I'm wondering because some problems are like 10 years old and I believe the difficulty level of a particular rating would have been increased
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Yes...the difficulty level is increased nowadays.
Have a look at this 11 years old bugaboo (rated 1800) from A2OJ. Direct implementation of diophantine equation:)