Typescript implementation of monotonic stack.

• A stack is called a monotonic stack if all the elements starting from the bottom of the stack is either in increasing or in decreasing order.
• The monotonic stack problem is mainly the previous/next smaller/larger problem.

export const monotonicIncreasingStack: (data: number[]) => number[];
export const monotonicDecreasingStack: (data: number[]) => number[];

• Next Greater Element (NGE): Find the first value on the right that is greater than the element.
• Next Smaller Element
• Previous Greater Element
• Previous Smaller Element
• Get the greatest or smallest array or string by the given conditions (remaining size k / no duplicate).