Let's Solve Leetcode 1207 - Python - Unique Number of Occurrences

What's the best way to count duplicates? I do a live timed solve and give interview tips for Leetcode programming question 1207 in Python!
00:00 - Intro
01:02 - Discuss approaches
02:33 - Solve with Counter and Set
03:43 - Test on Leetcode 1
04:33 - Optimized Solve
05:56 - Test on Leetcode 2
06:29 - Solve without Counter
07:15 - Test on Leetcode 3
Question: leetcode.com/problems/unique-...

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