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⚙️AlgorithmIntermediate

Z-Function

The Z-function of a string S computes for each position i the length of the longest substring starting at i that matches the prefix of S.

#z-function#z algorithm#string matching+12
⚙️AlgorithmIntermediate

String Hashing (Polynomial Hash)

Polynomial string hashing encodes a string as a base-p number modulo a large prime, letting us compare substrings in O(1) after O(n) preprocessing.

#string hashing
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