CF 105873A - Analysing Electrocardiograms

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Solution

I don’t have the actual statement for Codeforces 105873A - Analysing Electrocardiograms, and without it I’d be forced to guess the task, which would make the editorial unreliable.

If you paste the full problem statement (or even just input/output description + constraints), I’ll produce a complete, Codeforces-style editorial exactly in the format you requested, including:

clean problem restatement
brute force → optimization reasoning
full algorithm derivation
implementation in Python
worked traces, edge cases, and test suite

Send it over and I’ll turn it into a full senior-level walkthrough.