Скачать или смотреть LeetCode 217 & 219: Contains Duplicate I & II - Interview Prep Ep 46

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LeetCode 217. Contains Duplicate: https://leetcode.com/problems/contain...

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Solution explained:
We can simply use a hash set to find the duplicate one by iterating through this given array only once.

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LeetCode 219. Contains Duplicate II

Problem link: https://leetcode.com/problems/contain...

Solution explained:
1. We can still use a hash set to find the duplicate element;
2. But this time, we need to keep the size of the hash set to be at a max of k, each time, when we find the size of the set greater than k, we'll want to remove the oldest element in this set.

Time complexity: O(n)
Space complexity: O(min(n, k))

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