Insert Delete GetRandom O(1) | LeetCode 380 | Programming Tutorials
In this tutorial, I have discussed how we can implement insert, delete, getRandom() method in O(1) time complexity.
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Design a data structure that supports all following operations in average O(1) time.
insert(val): Inserts an item val to the set if it's not present.
remove(val): Removes an item val from the set if present.
getRandom : Returns a random element from current set of elements.
Each element must have the same probability of being returned.
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