Editorial for DMOPC '15 Contest 1 P3 - Itami and Cipher

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Author: cheesecake

As mentioned in the problem statement, there are only $26$ ~26~ possible shifts $(0 \le \text{shift} \le 25)$ ~(0 \le \text{shift} \le 25)~. Knowing this, we can simply search for string $T$ ~T~ in every single shift of string $S$ ~S~ in increasing order and output the first viable shift.

Time Complexity: $\mathcal{O}(|S| \times |T|)$ ~\mathcal{O}(|S| \times |T|)~, proof is left as an exercise for the reader.

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