BSTIterator:
https://leetcode.com/problems/binary-search-tree-iterator/
Solution: com.leetcode.BSTIterator
Reverse Words in String:
https://leetcode.com/problems/reverse-words-in-a-string/
Solution: com.leetcode.reversewords
Detect Cycle Linked List:
https://leetcode.com/problems/linked-list-cycle/
Solution: com.leetcode.cyclelinkedlist