Longest Common Prefix

Longest Common Prefix


This function should take an list of strings and determine the longest common prefix among all the strings. If there is no common prefix, it should return an empty string.


Input: List of strings (str).

Output: String (str).


assert longest_prefix(["flower", "flow", "flight"]) == "fl"
assert longest_prefix(["dog", "racecar", "car"]) == ""
assert longest_prefix(["apple", "application", "appetizer"]) == "app"
assert longest_prefix(["a"]) == "a"

How it’s used:

  • in autocomplete systems to suggest the most likely completion;
  • in file systems to suggest directory names based on current input;
  • in DNA sequence alignment to identify common substrings.

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CheckiO Extensions

CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.

In order to install CheckiO client you'll need installed Python (version at least 3.8)

Install CheckiO Client first:

pip3 install checkio_client

Configure your tool

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checkio serv -d

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checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium

Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.

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