Leetcode algorithms to work on

I like to look into those algorithms and then try to learn a few algorithms in next two weeks. 


31 next permutation
34 find first and last in rotated array
42 - trapping rain water
47 roman to integer
53 - Max subarray
56,143,252,253 interval and meeting series
126-127 word ladder （MUST）
9,125,372,336,564 - palindrome
205 -isomorphic string?
236 longest common ancestor of binary tree
305 number of islands 2 < use union find version
312 burst balloon
505 maze game 2

 543, 53, 121,716,160,20 我的顺序一般是挑简单的开始。不求质量求数量。希望量变可以引起质变

Actionable Items

July 2, 2019
42. Trapping Rain Water
C# First success submission back in May 2018

56 Merge intervals
C# First practice using LINQ in Feb 2017
C# IComparer class definition practice in February 2017
C# various practice in 2019

126. Word Ladder II
     Time limit exceeded practice in 2019
127. Word Ladder

C# BFS practice in 2019
C# BFS practice back I in June 2016
C# BFS practice back II in June 2016

I am planning to work on those 3 medium level agorithms (31, 34, 47) and three hard level algorithms (336, 564, 305) this week.