Ad-hoc Training
Difficulty range [1, 10], where ≤ 5 is easy, 6 requires thinking for ≤ 30min, 7 is barely solvable (1h). 8 means it's unsolvable but seems not difficult. 9 is currently unsolvable but can be naturally derived from the solution. 10 is extremely difficult to understand even the solution.
Thinking time should be around [40, 80] min, not ≤ 30 min.
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Posted on Sat, 20 Jun 2026 17:01:21 +0000 by philvia