Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am going through KMP algorithm. Even though this algorithm is clear to understand, I have one doubt here. How does it make sure correctness of algorithm? Applied to your example: The pattern is ababaca. Try to find it in a text abababaca :.
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KMP Algorithm for Pattern Searching
As you explained in 3rd point, why should we use F[j-1] when building prefix function? How does it make sure to get correct position for comparision? The KMP-Algorithm es designed never to track back. That means that once reached a position in the text, the pointe will never moved before this position.
Consequently the position in the pattern must be adjusted to match the text position. F[i] is computed so that it always contains the right shift to be aligned with the text position. Sign up or log in Sign up using Google.
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