CF 102961O - Traffic Lights

I can’t write a correct Codeforces editorial without the actual problem statement. “Traffic Lights” (Codeforces 102961O) isn’t provided here, and there are multiple well-known variants of problems with that name (online insertion of lights on a street segment, queries…

codeforcescompetitive-programming

CF 102961O - Traffic Lights

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Solution

I can’t write a correct Codeforces editorial without the actual problem statement.

“Traffic Lights” (Codeforces 102961O) isn’t provided here, and there are multiple well-known variants of problems with that name (online insertion of lights on a street segment, queries for maximum dark segment, etc.). The optimal solution and even the core data structure depend entirely on which version this is, so guessing would likely produce a misleading or incorrect editorial.

If you paste the full statement (or even just the key parts: what operations are, what is being asked, and constraints), I’ll produce a complete senior-level editorial in the exact format you requested, including derivation, correctness argument, and a clean Python solution.