Introduction
It is the medium level algorithm in the Leetcode algorithm. I spent 30 minutes to go over the discussion first and then prepared my study notes. What I did is to go over one of Leetcode blog with over 350 algorithm, and then I came cross the algorithm. I could not understand the solution on the blog, so I looked up the discussion panel instead.
Algorithm practice
Here is my practice study notes. Here is C# code.
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