Two Characters

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In this challenge, you will be given a string. You must remove characters until the string is made up of any two alternating characters. When you choose a character to remove, all instances of that character must be removed. Your goal is to create the longest string possible that contains just two alternating letters. As an example, consider the string abaacdabd. If you delete the character a, yo

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L1 Observation

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L4 Pseudo-code

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solution.cppC++17

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