Comprehensive Stack Interview Questions: From Basics to Advanced Problem-Solving.

1. Stack Basics

• Implementing a Stack Using Arrays
• Implementing a Stack Using Linked Lists
• Implementing a Stack Using Two Queues
• Implementing a Stack Using a Single Queue
• Stack Operations (Push, Pop, Peek)
• Implementing a Min Stack (Get Minimum in O(1) Time)
• Implementing a Max Stack (Get Maximum in O(1) Time)
• Implementing a Stack Using Two Stacks
• Implementing a Stack Using Recursion
• Stack Implementation Using Dynamic Arrays

2. Infix, Prefix, and Postfix Expressions

• Converting Infix to Postfix
• Converting Infix to Prefix
• Converting Postfix to Infix
• Evaluating a Postfix Expression
• Evaluating a Prefix Expression
• Validating an Infix Expression
• Parenthesis Matching (Balanced Parentheses)
• Implementing Shunting Yard Algorithm for Expression Parsing
• Converting Infix to Postfix with Associativity and Precedence Handling

3. Advanced Stack Operations

• Design a Stack that Supports GetMin, GetMax, and GetMedian
• Implementing a Two-Stack Queue
• Design a Stack with Increment Operation
• Implementing a Stack Using Deque
• Implementing Special Stack Operations (Double Push, Double Pop)
• Building a Stack from Scratch Without Using Built-In Data Structures
• Implement a Stack with Dynamic Resizing
• Implement a Stack That Supports Middle Element Access
• Implement Stack Sorting Using Recursion
• Implement a Custom Stack with Customized Push/Pop Rules

4. Stack-Based Problem-Solving

• Next Greater Element to the Right
• Next Greater Element to the Left
• Next Smaller Element to the Right
• Next Smaller Element to the Left
• Stock Span Problem
• Trapping Rain water Problem
• Simplify Directory Path (Unix Style Path Simplification)
• Evaluate Reverse Polish Notation
• Validating Stack Sequences

5. Stack and Recursion

• Reverse a Stack Using Recursion
• Sort a Stack Using Recursion
• Insert an Element at the Bottom of a Stack Using Recursion
• Finding Maximum Depth of Nested Parentheses
• Decode a String with Nested Patterns (e.g., "3[a2[c]]" → "accaccacc")
• Checking Redundant Parentheses in an Expression
• Flattening Nested Lists (Nested List Weight Sum)
• Recursive Depth Calculation Using Stack
• Implement an Algorithm for the Nearest Smaller Values (Monotonic Stack )

6. Real-World Stack Applications

• Implement Browser Back/Forward Functionality Using Stacks
• Design Undo/Redo Operations Using Stacks
• Evaluate Mathematical Expressions Using Stacks
• Simulating Call Stack in Function Execution
• Implement a Text Editor with Parentheses Matching Feature
• Balancing Chemical Equations Using Stacks

7. Stack Variants and Custom Implementations

• Design a Thread-Safe Stack
• Implement a Circular Stack
• Implement a Persistent Stack (Immutable Data Structures)
• Create a Lock-Free Stack Using Atomic Operations

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