Google Coding Interview Question | Leetcode 380 | Insert Delete GetRandom O(1)

In this video, we introduce how to solve the "Insert Delete GetRandom O(1)" question which is used by big tech companies like Google, Facebook, Amazon in coding interviews. We also cover how to behave during a coding interview, e.g. communication, testing, coding style, etc.

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[narendranaidulolugu]

Do we really need ArrayList? why can't we use hashmap for everything. in case if random just take random from keys.