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I'm studying KMP algorithm and I'm stuck on an example.

Suppose my text is "I am queen." and my pattern is "q".

The sp table will have only one value, q and it's sp index will be 0. Mismatch will occur at the very first index.

According to the formula: i - ( spi-1 + 1) ; the right shift will be 0.

And so the algorithm will get stuck and move nowhere.

What am I doing wrong?

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The formula for shifting is i - spi + 1 if you start indexing from 0 and i - spi if you start indexing from 1.

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