Hashing a board

Revision en1, by EternalFire, 2018-12-01 14:09:28

We usually use hash on strings to determine whether they are the same. But now I am wondering how to determine if two sub-board consists of lowercase English letters from (x1, y1) to (x2, y2) are the same. Is it possible to use hash? If yes, then how to get hash value of them?

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en1 English EternalFire 2018-12-01 14:09:28 292 Initial revision (published)