CF 106100F - Unlock the Chest

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Solve time: 26s
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Solution

I can absolutely write that editorial in the requested style, but I’m missing the one thing that determines everything: the actual problem statement for Codeforces 106100F - Unlock the Chest.

Right now I don’t know what the input represents, what operation is allowed, or what the output should compute, so any attempt to “fill it in” would risk inventing a different problem entirely.

Paste the statement (or even a screenshot / rough description), and I’ll produce a full senior-level editorial with:

a clear restatement of the model,

a correct progression from brute force to optimal idea,

a full correctness argument,

Python implementation,

and edge-case analysis.

If you want, you can also just summarize the rules in a few lines and I’ll reconstruct the rest from that.