In the context of the longest common substring problem, what does "substring" refer to?
- A contiguous sequence of characters within a string.
- A sequence of characters obtained by rearranging the characters of a string.
- A sequence of characters that appears exactly once in a string.
- Any sequence of characters, regardless of their arrangement, within a string.
In the context of the longest common substring problem, a "substring" refers to a contiguous sequence of characters within a string. It can be of any length and must appear in the same order as it does in the original string.
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