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Check If N and Its Double Exist.
Check If N and Its Double Exist leetcode whiteboard explanation.
Check If N and Its Double Exist leetcode java explanation.

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Chapters:
0:00​ Problem Introduction
0:55 Whiteboard Explanation
1:56 Simple Solution Pseudocode
3:18 Simple Code O(n*n)
4:48 TreeSet Solution O(n*log n)
8:53 HashSet Solution O(n)