33. Search in Rotated Sorted Array

https://leetcode.com/problems/search-in-rotated-sorted-array/discuss/

341. Flatten Nested List Iterator

• generator, sepecific to this question
• stack, interative https://leetcode.com/problems/flatten-nested-list-iterator/discuss/

155. Min Stack

https://discuss.leetcode.com/topic/7020/java-accepted-solution-using-one-stack