Introduction
It takes over 6 months to learn one algorithm similar to Leetcode 18: 4 sum, and also each of five practice is helpful and also documented. I just need to go over them again and figure out what to learn from those practices.
4 sum algorithm
5th practice, Dec. 27 2017, here is the blog. After the practice, I updated the code review code with this version to replace 4th version written in Nov. 2017, and also added some commented in the question.
4th practice, Nov. 4, 2017, here is the blog. After the practice, I posted the question on code review.
3rd practice, August 31, 2017, here is the blog.
2nd practice, April, 2017, here is the blog.
May 2017, Leetcode 18: 4 sum practice is here.
Here is the link to search 5 practice using label: 4 sum practice, Leetcode 18: 4 Sum.
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