Problem 2523. longest common substring : Skipped character version

Created by rifat

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Two strings are given. Find the longest common substring between them. The substring characters need not be adjacent. They, however, must appear in same order in both input strings.

Example:

str1 = 'abcdefghi';
str2 = 'zazbzczd';

output = 'abcd'

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108 Solutions
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Last Solution submitted on Dec 02, 2025

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Michael Ryan on 20 Aug 2014

Shouldn't there be two spaces between example and a in y_correct in test 4?

rifat on 20 Aug 2014

right.. corrected. Thanks :)

Alfonso Nieto-Castanon on 29 Sep 2014

perhaps add another test to avoid non-general solutions? (e.g. str1='abaa' str2='aaab' should return 'aaa')

James on 1 Nov 2017

For test 5:

str1 = 'a string with many characters';
str2 = 'zzz zzz zzz zzz zzz';

Why wouldn't the correct answer be four spaces instead of just one?

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