How to Fix Trie Prefix Search Errors

In this tutorial, you'll learn about How to Fix Trie Prefix Search Errors. We cover key concepts, practical examples, and best practices.

Fix trie prefix search errors when prefix check goes beyond trie depth or missing child returns wrong result.

Quick Fix

Wrong

def starts(self,p):
    n=self
    for c in p:
        n=n.children[c]
    return True

KeyError if character not in children. Crashes instead of returning False.

Right

def starts(self,p):
    n=self
    for c in p:
        if c not in n.children: return False
        n=n.children[c]
    return True

Trie with 'cat','car' -> starts('ca') -> True, starts('do') -> False. O(L).

Prevention

Check child existence with 'in' before accessing. Return False if any character missing.

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