Sorting
1.Easy
(169)Majority Element
2.Medium
(31)Next Permutation
(56)Merge Intervals
(148)Sort List
(215)Kth Largest Element in an Array
(253)Meeting Rooms II
(347)Top K Frequent Elements
(406)Queue Reconstruction by Height
(581)Shortest Unsorted Continuous Subarray
(621)Task Scheduler