Leetcode Problem 1923. Longest Common Subpath

1923. Longest Common Subpath

Leetcode Solutions

Define a rolling hash function that can generate hash values for subpaths.
Use binary search to find the maximum length L such that all paths have a common subpath of length L.
- In each iteration of binary search, use the rolling hash function to generate hash values for all subpaths of the current length mid.
- Use a set to keep track of hash values that are common to all paths.
- If there is at least one common hash value, it means a common subpath of length mid exists, and we can try a longer length.
- Otherwise, try a shorter length.
Continue the binary search until the maximum length of the common subpath is found.

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