Trie Practice Questions

The trie recognition signals:

1. A set/dictionary of strings is queried for membership or prefixes repeatedly.
2. You’re matching characters one at a time against many candidate words at once.
3. The problem says “prefix,” “starts with,” “shortest root,” “autocomplete,” or “common prefix.”
4. XOR maximization/pairs over integers → the bitwise trie.

If you see one of these, build a trie before you write anything else.