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DSA / Data Structures / Stack

Stack

261+ posts

Stack Implementation using Deque

Last Updated: 23 July 2025

A doubly ended queue or deque allows insertion and deletion at both ends. In a stack, we need to do insertions and deletions at one end only. We can use either end of dequ...read more

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Commonly Asked Data Structure Interview Questions on Stack

Last Updated: 06 September 2025

A stack follows the Last In, First Out (LIFO) principle, meaning the last element added is the first to be removed. Stacks are a fundamental data structure used in many re...read more

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Monotonic Stack in Python

Last Updated: 23 July 2025

A Monotonic Stack is a data structure used to maintain elements in a monotonically increasing or decreasing order. It's particularly useful in problems like finding the n...read more

Find Exclusive Time of Functions

Last Updated: 10 June 2024

Given a list logs, where logs[i] represents the ith log message formatted as a string "{function_id}:{"start" | "end"}:{timestamp}". For example, "0:start:3" means a funct...read more

Interview-Questions

Remove All Adjacent Duplicates in String II

Last Updated: 23 July 2025

Given a string s and an integer k, the task is to repeatedly delete k adjacent duplicates till no deletions are possible and then return the final string. On deletion of k...read more

Interview-Questions

Find maximum in stack in O(1) without using additional stack in Python

Last Updated: 05 June 2024

The task is to design a stack which can get the maximum value in the stack in O(1) time without using an additional stack in Python.Examples: Input: Consider the following...read more

Stack using Array

Last Updated: 15 December 2025

A stack is a linear data structure that follows the Last-In-First-Out (LIFO) principle. It can be implemented using an array by treating the end of the array as the top of...read more

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Data Structures-Stack

Stack Data Structure

Last Updated: 13 November 2025

A Stack is a linear data structure that follows a particular order in which the operations are performed. The order may be LIFO(Last In First Out) or FILO(First In Last Ou...read more

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Smallest subarray with positive sum for all indices

Last Updated: 23 July 2025

Given an array arr[] of size N. The task is to determine the minimum length of a subarray starting from index i, such that the sum of the subarray is strictly greater than...read more

Geeks Premier League

Data Structures

Geeks Premier League 2023

Stack Notes for GATE Exam [2024]

Last Updated: 23 July 2025

Stacks, a fundamental data structure in computer science, are crucial for understanding algorithmic paradigms and solving complex computational problems. As candidates gea...read more

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Check If it is Possible to Convert Binary String into Unary String

Last Updated: 11 December 2023

Given a binary string S of length N. You can apply following operation on S any number of times. Choose two adjacent characters, such that both are 1's or 0's. Then invert...read more

Geeks Premier League

Geeks Premier League 2023

How to Identify and Solve Monotonic Stack Problems ?

Last Updated: 23 July 2025

We all know what is Stack and how it works so today we will learn about a special type of data structure called monotonic stack. Problems using monotonic stack are difficu...read more

Count people who can Watch the Movie

Last Updated: 07 December 2023

Given N people are standing in a row and heights[], where the ith integer represents the height of the person. There is a movie screen at the rightmost position of the row...read more

Geeks Premier League

Data Structures

Geeks Premier League 2023

Mastering Bracket Problems for Competitive Programming

Last Updated: 23 July 2025

Bracket problems in programming typically refer to problems that involve working with parentheses, and/or braces in expressions or sequences. It typically refers to proble...read more

LIFO Principle in Stack

Last Updated: 23 July 2025

LIFO stands for "Last In, First Out". This principle dictates that the last element added to the stack is the first one to be removed. In other words, the most recently ad...read more

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