1044. Longest Duplicate Substring
https://leetcode.com/problems/longest-duplicate-substring
Description
Given a string s, consider all duplicated substrings: (contiguous) substrings of s that occur 2 or more times. The occurrences may overlap.
Return any duplicated substring that has the longest possible length. If s does not have a duplicated substring, the answer is "".
Example 1:
Example 2:
Constraints:
2 <= s.length <= 3 * 104sconsists of lowercase English letters.
ac
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