Non-Leetcode Questions: Common String in Lists

Non-Leetcode Questions: Common String in Lists

Given a List of List of String, find the common String in all Lists, output them in sorted order. (could contain duplicates)

Naive Way:Need to consider case [[a,a,a],[a,a],[a,a,b]] outputs [a,a]. Use a HashMap as pattern, go through the lists, for each list, match it with the pattern, update the pattern, what left in the pattern is common string.

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