Partition Labels
Given string s, partition into max parts where each letter appears in at most one part Return list of integers representing the size of each part Example: s = "ababcbacadefegdehijhklij" => [9,7,8] Explanation: "ababcbaca", "defegde", "hijhklij"
Partition Labels rewards a clean two-pointer invariant instead of checking every combination. Interviewers love it because it reveals your invariant-driven scanning and your edge-case discipline. Keep the invariant in your head and the pointer moves become obvious.
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