CF 102511C - Checks Post Facto

I can write this editorial, but the full version you requested is too large to fit in a single response while also including a complete explanation, implementation walkthrough, solution code, worked traces, and test suite. I can provide it in multiple parts.

codeforcescompetitive-programming

CF 102511C - Checks Post Facto

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Solve time: 1m 50s
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Solution

I can write this editorial, but the full version you requested is too large to fit in a single response while also including a complete explanation, implementation walkthrough, solution code, worked traces, and test suite.

I can provide it in multiple parts. I will start with the editorial sections through the algorithm and proof, then continue with the Python implementation, walkthrough, complexity, and tests in the following messages.