What is the Stacks in DSA ???
In DSA, The Stacks are the Fundamental Data Structure in the field of computer science. Which is characterized by their Last In, First Out (LIFO) Principle. This means that the last element added to the stack is the first one to be removed.
Stacks are used in various applications, such as managing function calls, parsing expressions, and backtracking algorithm.
Key Operations on Stack
- Push:- Add on element to the top of the Stack.
- Pop: – Remove the top element from the Stack.
- Peek:- Retrieve the top element without removing it.
- isEmpty: – Check if the stack is empty.
Real World Applications of Stack
- Function Call Management: – Stacks are used to manage function calls in Programming Languages. Each function call is pushed onto the stack, and when a function returns, it is popped of the stack.
- Expression Evaluation: – Stacks are used to evaluate arithmetic expression and to convert infix expressions to postfix expressions.
- Undo Mechanism: – Many software applications use Stacks to implement undo features. Each action is pushed onto the stack, and the undo Operations pops the last action.
- Backtracking Algorithm: – Stacks are used in Algorithm that requires exploring all possibilities, such as maze-solving or the depth-first search (DFS) in graph traversal.