Full form DSA :

The DSA full form is Data Structure and Algorithms

DSA Programmers

Basically DSA is used for Stack, Queue, Tree, Linked list, Double linked list, Dynamic program etc.

Stack

What is stack ?

• Explain the basic concept of a stack:

  • A stack is a linear data structure that follows the Last In First Out (LIFO) principle.
  • The last element added to the stack is the first one to be removed.
  • Everyday examples: Stack of plates, Undo feature in software.

• Common Stack Operations

  List the basic operations that a stack supports:

  • Push: Add an element to the top of the stack.
  • Pop: Remove the element from the top of the stack.
  • Peek/Top: Get the top element without removing it.
  • isEmpty: Check if the stack is empty.
  • Size: Get the number of elements in the stack.

  2. Stack Use Cases

  • Mention scenarios where stacks are useful:
    • Expression evaluation (infix to postfix, postfix evaluation).
    • Undo/redo operations.
    • Function call recursion.
    • Depth-first search (DFS) in graphs

  Implementation

https://lh5.googleusercontent.com/YXJkNIUjUJoi3BuI7BKp17dLM_lt0QO2kjbbm34tdYGNjVZS4qk_vEIeuQ6B7BmiAwrJPovZPin_ZPyOdFAkIYcnfs8yD4ctcpop8BCINIStY9LzawvUyMdwFv_5YVGvbGRfSvhx

1_a_stack.py

1_a_stack.cpp

some of the stack problems

1. stack using collections library
2. String reverse using stack
3. Balancing parenthesis
4. String palindrome
5. Find the maximum element
6. Find the minimum element

Solutions

• 1. Stack using collections library
• 2. String reverse using stack

The reverse algorithms

• 3. Balancing parenthesis