https://leetcode-cn.com/problems/lru-cache/
com.ithawk.learn.middle.LRUCache

https://redisbook.readthedocs.io/en/latest/internal-datastruct/skiplist.html

https://leetcode-cn.com/problems/container-with-most-water/
com.ithawk.learn.middle.MaxArea  

https://leetcode-cn.com/problems/move-zeroes/  
com.ithawk.learn.simple.MoveZeroes

https://leetcode-cn.com/problems/climbing-stairs/          
com.ithawk.learn.simple.ClimbStairs

https://leetcode-cn.com/problems/3sum/
com.ithawk.learn.middle.ThreeSum
            //将数据进行排序
            Arrays.sort(nums);

https://leetcode-cn.com/problems/reverse-linked-list/  
com.ithawk.learn.leetCode.array.ReverseList

https://leetcode-cn.com/problems/swap-nodes-in-pairs/  
com.ithawk.learn.middle.SwapPairs

https://leetcode-cn.com/problems/linked-list-cycle/   
com.ithawk.learn.leetCode.array.HasCycle  

https://leetcode-cn.com/problems/linked-list-cycle-ii/
com.ithawk.learn.leetCode.array.DetectCycle 

https://leetcode-cn.com/problems/valid-parentheses/
com.ithawk.learn.simple.IsValid