C++ Trie prefix tree解母音拼字Leetcode 966 Vowel Spellchecker
如果unordered_set, unordered_map有其他替方案就用，能用Trie去解也算是一種成就
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If there are alternatives to unordered_set and unordered_map, use them. Being able to solve them with Trie is also an achievement.
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