Can you solve this real interview question? Next Greater Element I - The next greater element of some element x in an array is the first greater element that is to the right of x in the same array. It can be implemented using a linked list, where each element of the stack is represented as a node. The possibilities are endless. Implement the MyQueue class: * void push(int x) Pushes element x to the back of the queue. 8K 84K views 4 years ago #python #path #stack 🚀 https://neetcode. You can use an additional temporary stack, but you may not copy the elements into any other data structure (such as an array). Alongside development, I actively practice Data Structures & Algorithms using C++ and solve problems on LeetCode. 05. 最大栈 - 备战技术面试？力扣提供海量技术面试资源，帮助你高效提升编程技能,轻松拿下世界 IT 名企 Dream Offer。. * void push(int val) Pushes the given integer val Level up your coding skills and quickly land a job. * int top() gets the top element of the stack Implement a LIFO stack using two queues, supporting standard stack operations like push, pop, top, and empty, with constraints and follow-up challenges. These problems are categorized into Easy, Medium, and Hard difficulty levels, ensuring comprehensive coverage of the topic. Level up your coding skills and quickly land a job. You must STACK STACK STACKWhat makes stack problems hard is not the logic, but the way we look at themMost monotonic stack problems aren’t new problems—they’re just small twists of the same templateI have created a template that I use to solve stack problems. Finally, if the stack is empty, it means that all pairings are successful and `true` is returned; otherwise, `false` is returned. * int pop() Removes the element on the top of the stack and 🚀 Day 77 | LeetCode Journey Today I solved LeetCode 1944 – Number of Visible People in a Queue. Jul 28, 2022 · Introduction I've had my fair share of time dealing with problem related to monotonic stack. Easy Problems Parenthesis Checker Reverse a String using Stack Jan 20, 2025 · Stack — data structure Leetcode patterns The difference between using an array and a list for implementing a stack lies in their underlying data structure, memory management, and performance … Awesome LeetCode resources to learn Data Structures and Algorithms and prepare for Coding Interviews. Basic Calculator 🎯 Day 87 of #100DaysOfLeetCode — Completed! 📌 Problem Solved: Valid Parentheses (LeetCode 20 – Easy) Today’s challenge was a classic but powerful one that reinforces stack-based Must-do List for Interview Prep Grind 75 is a better version of Blind 75 which goes beyond 75 questions. You have an empty stack with the two following operations: * "Push": pushes an integer to the top of the stack. A stack of books might be a good example to visualize, however, insertion and deletion can only happen from the one end. Oct 19, 2023 · Deep Dive into Stacks + LeetCode Practice Today, let’s delve into Stacks coupled with a LeetCode challenge. Its important to understand that, the question you encounter might not be a new … 对于不重复元素的情况，用queue存小的数，stack存大的数，先pop ()一个数，再peek一下，比较这两个数，如果pop的大，就代表肯定是quack的尾巴，反之肯定是头，然后插入queue或者stack就行了。 这里假设quack有empty方法。 vector<int> recover_quack(quack& qk) { queue<int> q; stack<int> s; Explore coding challenges on implementing stack using queues to enhance your problem-solving skills and prepare for technical interviews. io/ - A better way to prepare for Coding Interviews 🐦 Twitter: / neetcode1 more Nov 3, 2025 · DSA Fundamentals: Stack - From Theory to LeetCode Practice The Stack is one of the most fundamental data structures in computer science, following the Last In, First Out (LIFO) principle. Max Stack Description Design a max stack data structure that supports the stack operations and supports finding the stack&#39;s maximum element. Level up your coding skills and quickly land a job. I wanted to k 🚀 Day 40 of My Consistent DSA Journey Today I worked on a classic Linked List + Stack problem that beautifully combines data structures with careful carry handling. com/neetcode1🥷 Discord: https://discord. * void push(int val) pushes the element val onto the stack. void push (int x) Pushes element x onto the stack. The stack supports the following operations: push, pop, peek, and isEmpty. 3. A stack operates through the last-in first-out (LIFO) principle: the last item to go in is the first to 155. LeetCode Solutions in C++23, Java, Python, MySQL, and TypeScript. The 15 problems have been handpicked to cover all the important concepts, and are popular coding interview questions. Add Two Numbers II Oct 16, 2024 · #stack #geeksforgeeks #Leetcode #InterviewQuestion Question Asked By Microsoft Samsung FactSet SAP Labs Codenation. js, Node. For each 0 <= i < nums1. Use this pattern for problems that require finding the next greater or smaller element. This guide is divided into two main sections: Identifying Stack Problems Most Common to Least Common Techniques and Approaches to Solving Stack Problems Each section includes examples and references to the specific problems and solution outlines in this collection (e. * int top() gets the top element of the stack 2. 最小栈 - 实现一个支持获取最小值的栈，提供 push、pop、top 操作，并能在常数时间内检索最小值。 Level up your coding skills and quickly land a job. The concept of data structure is trivial. Stack Stack is the data structure The first item that comes in will be the first to go out. Last In, First Out (LIFO). This scenario that focuses on the `previous character` and the `current character` is suitable for implementation with a `stack`. 716. Use the two stack operations to Boost your coding interview skills and confidence by practicing real interview questions with LeetCode. You can only add or remove books from the top. * int pop() Removes the element on the top of the stack and LeetCode Solutions in C++23, Java, Python, MySQL, and TypeScript. Example 1: Input: haystack = "sadbutsad", needle = "sad" Output: 0 Explanation: "sad" occurs at index 0 and 6. Implement the MinStack class: * MinStack() initializes the stack object. Sep 13, 2025 · A stack is a linear data structure that follows the Last-In-First-Out (LIFO) principle. Boost your coding interview skills and confidence by practicing real interview questions with LeetCode. - ashishps1/awesome-leetcode-resources Jul 21, 2024 · The Monotonic Stack pattern uses a stack to maintain a sequence of elements in a specific order (increasing or decreasing). You also have a stream of the integers in the range [1, n]. For more information on stack, check out my previous article. 🧠 Approach: Used a Monotonic Decreasing Stack Traverse people from right to left For each Oct 27, 2024 · #stack #geeksforgeeks #Leetcode #InterviewQuestion Today Question : Infix to Postfix ExpressionsQuestion : Infix to prefix Expressions (Day 38 Video ) : ht Explore 16 DSA problem-solving patterns with links to LeetCode and Medium. int top () Gets the element on the top of the stack without removing it. int peekMax () Retrieves the maximum element in the stack without removing it. Declaration of Stack using Linked List A stack can be implemented using a linked list where we 232. * int top() gets the top element of the stack 2 days ago · CodeJudge – Online Coding Platform A full-stack coding platform inspired by LeetCode for solving algorithmic problems online, built from scratch using React, Node. Use the two stack operations to Welcome to the "Mastering LeetCode Stack Problems" playlist! This comprehensive series is designed to help you understand, solve, and master a variety of sta A lot of parsing questions (valid parentheses, braces, parsing math expressions), and basically anything where future data can impact earlier. You can customize the available time you have, difficulty, topics, etc. Can you solve this real interview question? Implement Stack using Queues - Implement a last-in-first-out (LIFO) stack using only two queues. The head of the linked list acts as the top of the stack. Learn algorithms, data structures, and coding interview strategies. Stack is a linear data structure that follows a particular order in which the operations are performed. 🚀 LeetCode Daily Challenge 🔗 Problem: https://lnkd. Our platform offers a range of essential problems for practice, as well as the latest questions being asked by top-tier companies. Key insight: • Backtracking = DFS on choices • Maintain one working list • Add → Acceptance Rate 66. 用栈实现队列 - 请你仅使用两个栈实现先入先出队列。队列应当支持一般队列支持的所有操作（push、pop、peek、empty）： 实现 MyQueue 类： * void push(int x) 将元素 x 推到队列的末尾 * int pop() 从队列的开头移除并返回元素 * int peek() 返回队列开头的元素 * boolean empty() 如果队列为空，返回 true ；否则 Can you solve this real interview question? Find the Index of the First Occurrence in a String - Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. - ctanishq/Stack-for-Coding-Interviews Can you solve this real interview question? Min Stack - Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. Can you solve this real interview question? Implement Queue using Stacks - Implement a first in first out (FIFO) queue using only two stacks. Another pattern would be monotonically increasing / decreasing stack questions, where you eliminate all entries greater / less than on each iteration. What is difficult is… Level up your coding skills and quickly land a job. May 9, 2024 · Stack Patterns Identifying and mapping a problem to a particular pattern is the key to solving LeetCode questions. You are given two distinct 0-indexed integer arrays nums1 and nums2, where nums1 is a subset of nums2. js, Express. For stack and queue problems, you’ll often use things like Deque and PriorityQueue. 5 % Topics Array Two Pointers Dynamic Programming Stack Monotonic Stack Companies Medium Medium Can you solve this real interview question? Implement Stack using Queues - Implement a last-in-first-out (LIFO) stack using only two queues. , Valid Parentheses, Basic Calculator, Evaluate Reverse Polish Moving stacks Jul 15, 2025 · The goal is to make ‘stack and queue leetcode’ problems feel a lot less scary and a lot more solvable. Sep 21, 2025 · A Stack is a linear data structure in which the insertion of a new element and removal of an existing element takes place at the same end, represented as the top of the stack. Contribute to hughiwnl/leetcode development by creating an account on GitHub. The order may be LIFO(Last In First Out) or FILO(First I Subscribe Subscribed 1. This is the best place to expand your knowledge and get prepared for your next interview. Master the Stack data structure for coding interviews. * int pop() Removes the element on the top of the stack and Can you solve this real interview question? Min Stack - Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. js, MongoDB, and Judge0 API 19 hours ago · LeetCode problem solutions implemented in C. * void push(int x) Adds x to the top of the stack if the stack has not reached the maxSize Can you solve this real interview question? Maximum Frequency Stack - Design a stack-like data structure to push elements to the stack and pop the most frequent element from the stack. Open brackets must be closed in the correct order Below is a comprehensive study guide for stack-based problems. int top() Gets the element Nov 13, 2025 · A Stack is a linear data structure that follows a particular order in which the operations are performed. Can you solve this real interview question? Design a Stack With Increment Operation - Design a stack that supports increment operations on its elements. * int top() gets the top element of the stack Level up your coding skills and quickly land a job. Implement the DinnerPlates class: * DinnerPlates(int capacity) Initializes the object with the maximum capacity of the stacks capacity. Stack: Think of a stack as a pile of books. It has been over two weeks, and I haven’t received any confirmation or rejection email yet. The input string is given as an array of characters s. Can you solve this real interview question? Max Stack - Level up your coding skills and quickly land a job. Queues are First-In, First-Out (FIFO), like a line at the grocery store. Tod Oct 10, 2024 · Before we start cracking some problems, let's quickly remind ourselves the basic of queue and stack. Ideal for college-level CS students. * void pop() removes the element on the top of the stack. And questions involving the stack data structure are very common in coding interviews. Oct 5, 2022 · Learn how to master the data structure, starting from the easiest problems on LeetCode and InterviewBit and slowly building up intuitions so that the hard problems seem easy. Implement the MaxStack class: MaxStack() Initializes the stack object. geeksforg 🚀 Day 43 of My Consistent DSA Journey Today I worked on a classic yet deceptively tricky problem that really tests your understanding of stacks and expression evaluation. io/ - A better way to prepare for Coding Interviews🐦 Twitter: https://twitter. * void push(int val) pushes an integer val onto the top of the stack. The implemented stack should support all the functions of a normal stack (push, top, pop, and empty). Can you solve this real interview question? Reverse String - Write a function that reverses a string. Let's look at this question (LeetCode Link) Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. I have created a curated list of 15 problems on the stack data structure. An input string is valid if: Open brackets must be closed by the same type of brackets. Sort of Stacks Description Write a program to sort a stack such that the smallest items are on the top. Implement the CustomStack class: * CustomStack(int maxSize) Initializes the object with maxSize which is the maximum number of elements in the stack. * int top() gets the top element of the stack Can you solve this real interview question? Build an Array With Stack Operations - You are given an integer array target and an integer n. g. We would like to show you a description here but the site won’t allow us. The first occurrence is at index 0, so we Nov 15, 2017 · Welcome to Subscribe On Youtube 716. void push(int x) Pushes element x onto the stack. * int pop() Removes the element from the front of the queue Can you solve this real interview question? Build an Array With Stack Operations - You are given an integer array target and an integer n. int pop () Removes the element on top of the stack and returns it. js, and MongoDB. in/d6g-i4Ef 💡 My thought process: The major difference between today's and yesterday POTD is that the fences which are mentioned in 90 Days Complete Coding Roadmap 🚀 | From Beginner to Job ReadyIs video me maine ek proper 90 days roadmap share kiya hai jo specially un students aur beginn Can you solve this real interview question? Implement Stack using Queues - Implement a last-in-first-out (LIFO) stack using only two queues. May 30, 2022 · Stack is used to address LIFO problems while queue for FIFO problems. Contribute to adityagarg63941-stack/leetcode-in-c development by creating an account on GitHub. * int pop() removes and returns the most frequent element Validate Stack Sequences - Given two integer arrays pushed and popped each with distinct values, return true if this could have been the result of a sequence of push and pop operations on an initially empty stack, or false otherwise. Can you solve this real interview question? Min Stack - Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. 17 hours ago · I recently applied to contribute a problem on LeetCode using the problem contribution flow. The order may be LIFO (Last In First Out) or FILO (First In Last Out). 🚀 https://neetcode. Question link : - https://www. Jun 28, 2024 · Stack — LeetCode Problems Github: LeetCode-Solutions by Mitchell Stack Implement a stack data structure in JavaScript that contains the following operations: new Stack (): Creates an instance of 🔥 Amazon SDE-1 Stack Master List (2024–2025) — PURE Stack & Monotonic Stack A clean, deduplicated, interview-focused list of PURE STACK problems frequently seen in Amazon SDE-1 interviews (2024–2025) and aligned with Striver’s stack patterns. Implement the MyStack class: * void push(int x) Pushes element x to the top of the stack. int pop() Removes the element on top of the stack and returns it. A minimal set of 15 problems, progressing from easy to hard. The implemented queue should support all the functions of a normal queue (push, peek, pop, and empty). Key Takeaways Stacks are about Last-In, First-Out (LIFO), like a pile of plates. * int pop() Removes the element from the front of the queue Can you solve this real interview question? Max Stack - Level up your coding skills and quickly land a job. * int top() gets the top element of the stack Oct 6, 2022 · The stack data structure is used frequently in programming, sometimes behind-the-scenes. I’m currently working as a Full Stack Web Developer Intern at Regex Software, Jaipur, where I work with JavaScript, React. Dec 10, 2024 · Top 50 Must-Do LeetCode Questions on Stacks for Your Coding Interview Preparation In this article, I have compiled a list of the top 50 LeetCode questions focused on Stacks, a fundamental data structure that you’ll encounter frequently in coding interviews. org YouTube channel that wi Can you solve this real interview question? Dinner Plate Stacks - You have an infinite number of stacks arranged in a row and numbered (left to right) from 0, each of the stacks has the same maximum capacity. 150 Days of DSA Challenge - Daily Update Today, as part of my 150 Days of DSA Challenge, I worked on the LeetCode Baseball Game problem, which provided practical exposure to using the stack data Solved Subsets and Subsets II on LeetCode , but the real win was understanding the pattern, not the code. When the stack is empty, peek should In this video we go through the solution and problem solving logic, walking through pretty much every leetcode question you need to know to pass a tech/progr Jun 19, 2021 · Daily Temperatures - Monotonic Stack - Leetcode 739 - Python NeetCode 1M subscribers Subscribe Jul 25, 2023 · For each token, if it’s a number, we push it to the stack; if it’s an operator, we pop two numbers from the stack, perform the operation, and push the result back to the stack. Implement the FreqStack class: * FreqStack() constructs an empty frequency stack. takeuforward is the best place to learn data structures, algorithms, most asked coding interview questions, real interview experiences free of cost. Use the two stack operations to Can you solve this real interview question? Min Stack - Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. Sep 4, 2025 · Mastering Stack Data Structure – From Basics to LeetCode Practice Stacks are one of the Tagged with dsa, programming, cpp, algorithms. To be honest, some of the parts have been fairly confusing. To learn about Stack Data Structure in detail, please refer to the Tutorial on Stack Data Structure. 4. This post seeks not just to impart knowledge, but also to offer a hands-on challenge to … Mar 17, 2024 · Python JavaScript LeetCode Meditations — Chapter 4: Stack A stack data type is perhaps one of the most well-known ones. We just published a course on the freeCodeCamp. The mapping relationship between left and right brackets can be saved in a `Map`. Leetcode solutions for practice. length, find the index j such that nums1[i] == nums2[j] and determine Aug 31, 2024 · I have solved over 30 + problems of Stack on Leetcode and I find stack is a very useful data structure that can be used in problems for… MaxStack () Initializes the stack object. LeetCode solutions in any programming language 03. gg/ddjKRXPqtk🐮 S Can you solve this real interview question? Build an Array With Stack Operations - You are given an integer array target and an integer n. In this card, we introduce two different processing orders, First-in-First-out and Last-in-First-out and its two corresponding linear data structures, Queue and Stack. * "Pop": removes the integer on the top of the stack.

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