https://oj.leetcode.com/problems/maximal-rectangle/
 https://oj.leetcode.com/problems/remove-duplicates-from-sorted-list-ii/
https://oj.leetcode.com/problems/remove-duplicates-from-sorted-list/
https://oj.leetcode.com/problems/remove-duplicates-from-sorted-array/
https://oj.leetcode.com/problems/remove-duplicates-from-sorted-array-ii/
https://oj.leetcode.com/problems/search-in-rotated-sorted-array/
https://oj.leetcode.com/problems/search-in-rotated-sorted-array-ii
https://oj.leetcode.com/problems/largest-rectangle-in-histogram/