Solution: Partition Labels
Understand how to divide a string into the maximum number of non-overlapping partitions where each letter appears only once. Explore the two-pointer method combined with tracking last occurrences of characters to identify valid partition boundaries and practice implementing this linear time and constant space complexity solution.
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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:
s.length...