Longest Repeating Substring
Longest Duplicate Substring

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Problem Statement:
Given a string S, find out the length of the longest repeating substring(s). Return 0 if no repeating substring exists.
Example 1:
Input: S = "abcd"
Output: 0
Explanation: There is no repeating substring.
Example 2:
Input: S = "abbaba"
Output: 2
Explanation: The longest repeating substrings are "ab" and "ba", each of which occurs twice.
Example 3:
Input: S = "aabcaabdaab"
Output: 3
Explanation: The longest repeating substring is "aab", which occurs 3 times.
Example 4:
Input: S = "aaaaa"
Output: 4
Explanation: The longest repeating substring is "aaaa", which occurs twice.
Solution:
Algorithm:
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Java Solution with Detailed Explanation of Implementation Logic:
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Python Solution with Detailed Explanation of Implementation Logic:
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Space Optimization by using Hash Code of Substrings:
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