Introduction
I like to work on a hard level algorithm on leetcode.com. Also I do not like to rush and find the answer as I do sometimes. Through the learning experience of Leetcode 10: regular expression matching, I know that it may take me 10 practice before I can fully understand the hard level algorithm.
First 30 minutes
On Feb. 6, 2018 I had chance to work on the algorithm called Leetcode 301: removed invalid parentheses. I like to write down the notes and see if I can find the answer through the first 30 minutes work.
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