https://oj.leetcode.com/problems/gray-code/
https://oj.leetcode.com/problems/majority-element/
https://oj.leetcode.com/problems/search-in-rotated-sorted-array/
https://oj.leetcode.com/problems/convert-sorted-array-to-binary-search-tree/
https://oj.leetcode.com/problems/convert-sorted-list-to-binary-search-tree/
https://oj.leetcode.com/problems/reverse-nodes-in-k-group/
https://oj.leetcode.com/problems/partition-list/