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netflix's blog

By netflix, history, 3 years ago, In English,

Whenever I solve a question using the Keyword Tree / Trie data-structure, I implement it using pointers. But I have seen many programmers implementing trie using arrays.

What are the downsides of using the Pointers implementation (if at all) , as compared to the Arrays implementation ?

Pointers Implementation Code

Arrays Implementation Code

Happy Coding !

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3 years ago, # |
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Pointers dynamically allocate memory which takes a bit more time. In array implementation you already have a fixed size declared- this saves time. So you see there is a trade-off between time and memory. Both are equally efficient under normal circumstances. Only when the constraints are too tight you may need to choose between the two.