Stack Top interview questions.
(1) Nearest Greater to left - https://www.geeksforgeeks.org/closest-greater-or-same-value-on-left-side-for-every-element-in-array/
(2) Nearest Greater to right- https://www.geeksforgeeks.org/next-greater-element/
(3) Nearest Smaller to left - https://www.geeksforgeeks.org/find-the-nearest-smaller-numbers-on-left-side-in-an-array/
(4) Nearest Smaller to right-https://www.geeksforgeeks.org/next-smaller-element/
(5) Stock Span Problem - https://www.geeksforgeeks.org/the-stock-span-problem/
(6) Maximum Area Histogram - https://leetcode.com/problems/largest-rectangle-in-histogram/
(7) Maximum Area of rectangle in Binary matrix - https://www.geeksforgeeks.org/maximum-size-rectangle-binary-sub-matrix-1s/
(8) Rain Water Trapping - https://leetcode.com/problems/trapping-rain-water/
(9) Implementing in Min Stack- https://leetcode.com/problems/min-stack/
(10) Implementing Stack using heap - https://www.geeksforgeeks.org/implement-stack-using-priority-queue-or-heap/
(11) The Celebrity Problem - https://www.geeksforgeeks.org/the-celebrity-problem/
(12) Largest Valid parantheses- https://leetcode.com/problems/longest-valid-parentheses/
(13) Tower of Hanoi- https://www.geeksforgeeks.org/c-program-for-tower-of-hanoi/
