Implement Stack using Linked List
Learning DSA practice problem on Onlearn.
Difficulty: easy.
Topics: Implementation of Stack using Linked List, Stack, Linked List, Singly Linked List, Node, Pointer, Data Structures, Algorithm, Time Complexity, Space Complexity, Big O Notation, stack operations, stack, conditional logic, general programming, tracking values, linked list, Stack Operations, Queue Operations.
Implement a Stack using a Singly Linked List Problem Statement Design and implement a Stack data structure using a singly linked list. Your stack should support the following common operations: push(int x): Inserts element x onto the stack. pop(): Removes the element on top of the stack and returns it. If the stack is empty, return 1. top(): Returns the element on top of the stack without removing it. If the stack is empty, return 1. isEmpty(): Returns true if the stack is empty, false otherwise. size(): Returns the number of elements currently in the stack. Input Specification There is no specific input format. You will implement a class with the specified methods. Output Specification push(int x): No explicit return value (void). pop(): Returns the integer value of the popped element, or 1 if empty. top(): Returns the integer value of the top element, or 1 if empty. isEmpty(): Returns a boolean (true or false). size(): Returns an integer representing the current number of elements. Constraints The values stored in the stack (x) will be integers. The number of operations performed will be within standard competitive programming limits (e.g., up to 10^5 operations). Sample Test Cases Input: Expected Output (return values of operations):