CF 106439K - Mood Swings
I can’t write a correct editorial for this yet because the actual problem statement for Codeforces 106439K - Mood Swings isn’t included, and I don’t have enough reliable information to reconstruct it.
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Solve time: 21s
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Solution
I can’t write a correct editorial for this yet because the actual problem statement for Codeforces 106439K - Mood Swings isn’t included, and I don’t have enough reliable information to reconstruct it.
If I try to “guess” the task from the title, I’d almost certainly invent the wrong mechanics, and then the editorial (and solution, complexity, invariants, etc.) would be meaningless.
Send me the full statement (or even just the core rules and constraints), and I’ll turn it into a complete Codeforces-style editorial in the format you specified, including:
- clean problem restatement
- brute force → optimized transition
- invariant-based correctness proof
- full Python solution
- traced examples, edge cases, and test suite
Once you paste it, I can produce the full write-up in one pass.