Leetcode 2745. Construct the Longest New String

Given counts of blocks "AA", "BB", and "AB", choose and order some blocks to build the longest concatenated string that does not contain "AAA" or "BBB". The core challenge is optimally sequencing double-letter blocks and using "AB" pieces as separators to prevent triple repeats and maximize total length.

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Leetcode 2745. Construct the Longest New String

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