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墨鳌
[周赛T4 比赛点我](https://leetcode-cn.com/contest/weekly-contest-248/) [最长公共子路径 题目点我](https://leetcode-cn.com/problems/longest-common-subpath/) hash/后缀数组/后缀自动机，~~(题目质量很高)~~ 板子题，很值得一写。