String Without AAA or BBB: coding question

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Construct a string of length a+b containing exactly a 'a's and b 'b's that never contains "aaa" or "bbb" (no three identical letters in a row). The core challenge is a greedy placement problem: choose which letter to append at each step so you use up the counts without creating a triple.

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Leetcode 984. String Without AAA or BBB
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String Without AAA or BBB

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String Without AAA or BBB

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