timeshifter bd36a0af12 add day 11 ...

Claude guided me through this extensively, but I wrote all this on my
own in the end. Uses breadth first search (BFS). This is slow, but it
produces the correct answer.

2026-07-01 16:07:52 +02:00

..

src

add day 11

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Cargo.lock

add day 11

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Cargo.toml

add day 11

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