1st round:
First Bad Version: https://leetcode.com/problems/first-bad-version/
Alien Dictionary: https://leetcode.com/problems/alien-dictionary/
2nd round:
Search in Rotated Sorted Array : https://leetcode.com/problems/search-in-rotated-sorted-array/
Search in Rotated Sorted Array II: https://leetcode.com/problems/search-in-rotated-sorted-array-ii/