Leetcode 3104. Find Longest Self-Contained Substring
Find the longest substring such that every character in that substring has all of its occurrences contained within it (i.e., no character from the substring appears outside it). This reduces to computing each character's first/last index and merging overlapping intervals (or using a two-pointer/scan) to identify the longest valid segment.
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Amazon
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Mid January, 2025
Amazon
Junior
Find the longest self-sufficient substring in a given string. A self-sufficient substring cannot be the full string, and no letter in the substring can occur both inside and outside the substring. Return the length of the longest such substring, or 0 if none exists.
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