Description https://leetcode.com/problems/design-a-stack-with-increment-operation/ Design a stack which supports the following operations. Implement the CustomStack class: CustomStack(int maxSize) Initializes the object with maxSize which is the maximum…

Description https://leetcode.com/problems/maximum-nesting-depth-of-the-parentheses/ A string is a valid parentheses string (denoted VPS) if it meets one of the following: It is an empty string “”,…

Description https://leetcode.com/problems/implement-queue-using-stacks/ Implement a first in first out (FIFO) queue using only two stacks. The implemented queue should support all…

Description https://leetcode.com/problems/implement-queue-using-stacks/ Implement a last in first out (LIFO) stack using only two queues. The implemented stack should support all…

Description https://leetcode.com/problems/decode-string/ Given an encoded string, return its decoded string. The encoding rule is: k[encoded_string], where the encoded_string inside the square brackets is…

Description https://leetcode.com/problems/maximum-frequency-stack/ Implement FreqStack, a class which simulates the operation of a stack-like data structure. FreqStack has two functions: push(int x), which…

Description https://leetcode.com/problems/valid-parenthesis-string/ Given a string containing only three types of characters: ‘(‘, ‘)’ and ‘*’, write a function to check…

Description https://leetcode.com/problems/backspace-string-compare/ Given two strings S and T, return if they are equal when both are typed into empty text editors. # means a backspace character. Example…