Solution: Partition Labels
Explore the two pointers technique to solve the partition labels problem by dividing a string into the maximum number of parts where each character appears only once. Understand how to track last occurrences of characters to determine valid partition boundaries and implement this efficient linear-time algorithm.
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Statement
You are given a string s. Your task is to divide the string into as many parts as possible such that each letter appears in at most one part.
In other words, no character should occur in more than one partition. After concatenating all parts in order, the result should be the original string s.
For example, given s = "bcbcdd", a valid partition is ["bcbc", "dd"]. However, partitions like ["bcb", "cdd"] or ["bc", "bc", "dd"] are invalid because some letters appear in multiple parts.
Return a list of integers representing the sizes of these partitions.
Constraints:
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