Some background context:

Wikipedia has an explanation of the Knuth-Morris-Pratt algorithm for substring searches.

The difference between a substring and a subsequence is that a subsequence is not necessarily contiguous (all the characters must be present, and in the correct order, but there can be unrelated characters in between).

In reply to Re: Can KMP be used to find the longest common subsequence? by Thilosophy
in thread Can KMP be used to find the longest common subsequence? by Anonymous Monk

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