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14. Longest Common Prefix求最长公共前缀。 巧妙使用indexOf，时间复杂度还行。class Solution { public String longestCommonPrefix(String[] strs) { if (strs.length == 0) return ""; String pre = strs[...

  175 Combine Two Tables     Table: Person+-------------+---------+| Column Name | Type |+-------------+---------+| PersonId | int || FirstName | varchar || L...