public class Solution
extends Object
1044 - Longest Duplicate Substring\.
Hard
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:**
**Input:** s = "banana"
**Output:** "ana"
**Example 2:**
**Input:** s = "abcd"
**Output:** ""
**Constraints:**
* 2 <= s.length <= 3 * 104
* `s` consists of lowercase English letters.