1. The stack data structure can come in handy here in representing this recursive structure of the problem. We can't really process this from the inside out because we don't have an idea about the overall structure. But, the stack can help us process this recursively i.e. from outside to inwards.
2. The capability of finding matching prefix is where the data structure called Trie would shine, comparing the hashset data structure. Not only can Trie tell the membership of a word, but also it can instantly find the words that share a given prefix. As it turns out, the choice of data structure (Trie VS. hashset), which could end with a solution that ranks either the top 5\%5% or the bottom 5\%5%.
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