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Property: Round-Trip Codec

CHALLENGE

Difficulty: advanced+25 XP

Implement both halves of a tiny codec and prove the round-trip property: decode(encode(v)) == v for every vector. Encoding: run-length, e.g. {3,3,3,5} -> "3x3,1x5". Decode parses that exact format back. Empty vector encodes to the empty string and decodes back to empty.

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