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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

Tree DP - Rerooting Technique

Rerooting (a.k.a. 换根 DP) computes a per-node answer as if each node were the root, in total O(n) time on trees.

#rerooting
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Filtering by:
#prefix suffix
#tree dp
#prefix suffix
+11
⚙️AlgorithmIntermediate

DP on Trees

DP on trees is a technique that computes answers for each node by combining results from its children using a post-order DFS.

#tree dp#post-order dfs#rerooting+12