More Problems

• Implement a stack to simulate a queue (queue using two stacks).
• Write a program to check if a string has balanced parentheses using a stack.
• Design a stack that supports getMin() in constant time without using additional stacks.
• Implement a function to reverse a stack using recursion without using any additional stack.
• Write a program to sort a stack such that the smallest elements are on the top.
• Create a function to find the next greater element for each element in an array using a stack.
• Implement a stack to find the longest valid substring of parentheses.
• Write a program to implement a basic calculator using a stack for handling operations and parentheses.