#1624

Largest Substring Between Two Equal Characters

pupil · 300 · lc easy +20 · verified · 68.3% accepted · 1,407 likes · top 75%

Description

Given a string s, find the longest substring that lies strictly between two identical characters. Return its length, or -1 if no character appears more than once in s.

Example 1:

Input: s = "aa"
Output: 0
Explanation: The optimal substring here is an empty substring between the two 'a's.

Example 2:

Input: s = "abca"
Output: 2
Explanation: The optimal substring here is "bc".

Example 3:

Input: s = "cbzxy"
Output: -1
Explanation: There are no characters that appear twice in s.

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