Dsa Trie Search

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

Fix trie search errors when early termination or end-of-word check missing.

Quick Fix

Wrong

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

Returns True for words that are only prefixes. 'car' returns True when only 'car' inserted.

Right

def search(self,w):
    n=self
    for c in w:
        if c not in n.children: return False
        n=n.children[c]
    return n.is_end

Trie with 'cat','car' -> search('ca') -> False (prefix but not word). O(L).

Prevention

Always check is_end on final node. Returns False for prefixes that are not complete words.

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