Leetcode patterns: Google - hard level

 Here are 26 algorithms I like to go over at least once. 

First Missing Positivehttps://leetcode.com/problems/first-missing-positive/
Longest Consecutive Sequencehttps://leetcode.com/problems/longest-consecutive-sequence/
Merge k Sorted Listshttps://leetcode.com/problems/merge-k-sorted-lists/
Smallest Range Covering Elements from K Listshttps://leetcode.com/problems/smallest-range-covering-elements-from-k-lists/
Insert Intervalhttps://leetcode.com/problems/insert-interval/