Top two pointer problems. As you solve more problems, yo...

  • Top two pointer problems. As you solve more problems, you’ll develop an intuition for The Two Pointer Technique is one of the most efficient strategies in computer algorithms, especially when dealing with problems involving arrays and strings. Usually, the problems related to strings and arrays can be solved by brute force, which By moving the pointers towards each other step by step based on the current sum, I was able to efficiently find the best value pair under the budget without checking In this tutorial, we at Scaler help you solve important coding interview questions on Two Pointers. Our platform offers a range of essential problems for practice, as well as the latest questions being Remember, the key to success with the Two Pointers technique lies in practice and pattern recognition. Two-pointer pattern is one of them. If you are preparing for technical interview, two pointers is one of the Level up your coding skills and quickly land a job. The guide is organized into two main sections: first, how to recognize a two-pointers problem, and second, a Popular and most classic Leetcode Two Pointer questions. Below are some classifications, although they are in no way exhaustive. In one scenario, one pointer starts from the beginning and The Two-Pointers Technique is a simple yet powerful strategy where you use two indices (pointers) that traverse a data structure - such as an array, I have been solving all two pointers tagged problems in last 3. In this exclsuive video, we at Scaler, help you solve some In problem-solving, there are a couple of patterns that help to solve the problem efficiently. Traverse both linked lists simultaneously by moving the pointers ptr1 and ptr2 one node at a time. As the name suggests, in this technique you have two pointers that are usually just variables pointing to the indices of the array. Below is a list of practice problems from Leetcode that The Two-Pointers Technique is a simple yet powerful strategy where you use two indices (pointers) that traverse a data structure - such as an array, list, or string - Join over 28 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. This approach is widely used in competitive programming and real-world applications such as finding pairs with a given sum, merging sorted arrays, and optimizing subarray problems. Multiple Pointers While traditionally two-pointer problems involve exactly two pointers, it's not uncommon to encounter problems where more than two Multiple Pointers While traditionally two-pointer problems involve exactly two pointers, it's not uncommon to encounter problems where more than two The two-pointer approach is a must-know technique for any software developer preparing for interviews. Below For the purpose of this article, a pointer is an index of an array. Two are better than one if they act as one. For string problems (like "at most K changes"), two pointers + frequency counters are your friends. By understanding when and how to apply this technique, you can Solve the most popular two pointers interview questions. Boost your coding interview skills and confidence by practicing real interview questions with LeetCode. Mastering two-pointer problems can significantly enhance your problem-solving skills during technical interviews. com/problems/two-sum-iv-input-is-a-bst/ Here’s a list of important Two Pointers problems on LeetCode, curated with their strategies and direct links. In this video, I talk about the two pointers technique which is a very important DSA topic for coding interviews. Level up your coding skills and quickly land a job. One pointer Discover the nuances of using 'and' and 'or' conditions with the two pointers technique in LeetCode problems, demonstrated through merging two sorted lists. Level up your coding skills and quickly land a job. The two-pointer technique is one of the most elegant and efficient algorithmic patterns in computer science. You place two indices (pointers) in different positions (often at the start and end of an array), then move This approach optimizes solutions for problems involving searching, sorting, and partitioning by using two indices to traverse data structures. This Learn the two-pointer technique with examples. The two-pointer technique is a fundamental and versatile problem-solving strategy that is particularly useful in solving array and string-related problems. By mastering this method, you can tackle a wide array Two-pointer technique is commonly used to solve array problems very efficiently. Hello, I have been solving all two pointers tagged problems in last 3. Our platform offers a range of essential problems for practice, as well as the latest questions being Initialize two pointers, ptr1 and ptr2, to the heads of the two linked lists, respectively. They are primarily used whenever a function needs to Enter two pointers: we could solve these problems by brute force using a single iterator, but this often involves nesting loops, which increases the time The two-pointer technique is a versatile and efficient strategy commonly used in solving problems on arrays, strings, linked lists, and other data structures. 5 months, and wanted to share my findings/classifications here. We can check these two values The two-pointer technique is a widely used approach to solving problems efficiently, particularly scenarios involving arrays or linked lists. Prepare for DSA interview rounds at the top companies. Top Practice Problems for Interviews on Two Pointer Technique The following list for two pointer coding problems covers a range of difficulty levels, from easy to hard, to help candidates prepare for interviews. What You’ll Learn: For string problems (like "at most K changes"), two pointers + frequency counters are your friends. Codeforces. The types of problem for which you should consider Instead of brute force approaches that check all possible pairs or subarrays, the two pointer approach smartly uses left and right indices (or Two Pointer Technique Two Pointer Technique is a useful strategy for solving a variety of array-based problems in a more efficient manner. In this tutorial, we’ll discuss the two-pointer approach for solving problems involving arrays and lists. This approach Boost your coding interview skills and confidence by practicing real interview questions with LeetCode. It involves using two pointers or indices to solve problems by maintaining multiple Is it possible to reduce a three-pointer problem to multiple two-pointer problems if managing three or more pointers is impossible or extremely difficult? Yes, we Below is a detailed study guide that analyzes the Two Pointers problems from the collection. The technique proves to be a powerful tool for The provided content is a comprehensive guide detailing strategies and tips for solving two-pointer problems on LeetCode, including understanding indicators for such problems, employing various In the other scenario, one pointer moves at a slow speed, while the other pointer moves at a fast speed, both of them moving in the same direction. Conclusion The two-pointer approach is a valuable tool in the programmer, offering a versatile and efficient technique for solving array-related problems. Programming competitions and contests, programming community Codeforces and Polygon may be unavailable from February 22, 6:30 (UTC) to February 22, 20:30 (UTC) due to technical Imagine the two-pointer technique as a strategic way of navigating through data, typically an array, using two “markers” or “indexes” that help you solve problems more efficiently. You place two indices (pointers) in different positions (often at the start and end of an array), then move There are many Leetcode problems you can solve with two pointer technique and its variations. This video will help you with step by step solutions to T Two pointer problems!!!!! let’s solve a few “Two pointers” problems Best Time to Buy and Sell Stock You are given an array prices where prices [i] is the price of For some reason I struggle with 2 pointer and sliding window questions a lot, I can solve old problems but not new ones. You can find a list here Explore the top Two Pointer problems in Data Structures and Algorithms. The two-pointer technique is a versatile algorithmic approach used to solve problems involving arrays, lists, or strings by maintaining two pointers that move through the data structure in a coordinated Master the Two Pointers technique used in algorithmic problem-solving. By using two pointers to traverse data structures The two pointer technique is a near necessity in any software developer's toolkit, especially when it comes to technical interviews. Want to nail your next technical interview? Here's a list of the top 6 Two Pointers interview questions and answers for 2025. In essence, the Two Pointer technique aims to address problems where identifying pairs, subarrays, or specific patterns within arrays or linked lists is crucial. Conclusion The Two Pointers technique is a must-have weapon in a competitive programmer's arsenal. This guide will walk you through the complete concept of the Two Pointers technique, its motivation, real-world applications, variations, problem The Two Pointers technique is a fundamental approach used in many array and string problems. This method is highly Problems on 2 Pointers are a test of your observation skills and how well you can deduce patterns. The two pointer technique is a must-know strategy for technical interview candidates. It allows solving a class of problems efficiently by using two pointers to iterate through arrays or linked The two-pointer technique is a powerful tool in any programmer’s arsenal, especially when tackling array-based problems in coding interviews. com/problems/permutation-in-string/ 0653 - Two Sum IV - Input is a BST (Easy) Author: @madhu915 | https://leetcode. The two-pointer technique is a search algorithm used to solve problems involving collections such as arrays and lists by comparing elements pointed by two Two pointers is a popular technique in the interview problems. Our platform offers a range of essential problems for practice, as well as the latest questions being Two Pointer 🚀| Summary with practice questions Sheet (C++) on LeetCode Hi, my name is Mahesh. To organize my own learning, I created this collection of Easy and Medium The Two Pointer technique is one of the most intuitive yet powerful problem-solving strategies used in competitive programming and system design questions In this playlist, we will solve and understand popular problems on Two Pointers Technique asked by Top Companies like - Amazon, - Meta, - Google, - Microsoft Help with Two Pointer techniques Hello, I have been working with the Two Pointer pattern for the past few days and am struggling with identifying when to use M Umair Ullah Posted on Aug 2, 2025 What I Wish I Knew Before Learning the Two Pointer Algorithm # dsa # programming # cpp # 2pointers 🚀 Mastering the Two Mistake # 2: Using uninitialized pointers The usage of an uninitialized pointer typically results in program crashes if the pointer accesses memory it is not Conclusion The Two Pointers technique is a powerful tool in any programmer’s arsenal, especially when tackling array and string problems. Programming competitions and contests, programming community This collection is designed to help you understand and master the Two Pointer Technique, a powerful approach for solving array and string problems efficiently. Two pointer algorithm is one of the most commonly asked questions in any programming interview. Learn how to solve array, linked list, and string problems efficiently using this powerful algorithm. Use this as a checklist or a guide to mastering this A pointer in C is a way to share a memory address among different contexts (primarily functions). Whenever an array question deals with finding two numbers in an array that The Two Pointers technique is a fundamental approach used in many array and string problems. If you're having dual monitor mouse pointer problem on your Windows computer, adjust your mouse settings or try our other solutions to fix it. Whether it is searching, manipulation, The Two Pointers pattern involves using two variables (usually called left and right, or i and j) that traverse a data structure at different speeds or from different directions. These Uhm when you have to compare/use 2 elements in array or string like naive approach would be using nested loops than time complexity will be to O (n 2) instead of that we will use a single loop to The Two-Pointer Technique is one of the simplest yet most powerful patterns used across arrays, strings, and linked lists. Specifically I can’t wrap my head around trapping rain water and convince myself The Two Pointer technique involves maintaining two indices (pointers) that traverse a data structure in a specific manner to optimize performance. This is the best place to expand your knowledge and get prepared for your next interview. This technique is an easy and efficient way to improve the Two-pointer is a quite common method used to solve Leetcode problems related to strings, arrays and linked lists. Author: @wkw, @ColeB2 | https://leetcode. In this guide, we'll cover the basics so that you know when and The Two Pointers technique is a powerful strategy that enhances your ability to efficiently solve problems by maintaining two pointers that traverse a data structure, often an array or a linked list. If either pointer The ‘left’ pointer will reference the left most index and the ‘right’ pointer will reference the right most index. I have solved more than 500+ questions on LeetCode and Codeforces. The strategy involves using two Level up your coding skills and quickly land a job. The two pointers technique is mainly used for solving problems that have a linear time complexity, it can lead to substantial performance improvements over a brute-force approach. . Perfect for sharpening your coding skills and acing interviews! There are a lot of ways to classify two pointer problems. There are two common scenarios in which the two-pointer approach is used. Classifications Same The Two Pointers technique is a powerful tool in your coding arsenal, and we'll walk you through the best problems to practice and master this approach. By reducing time complexity and often allowing for in The two-pointer technique is a fundamental algorithmic approach that plays a pivotal role in optimizing solutions to specific types of problems in computer The two pointer approach is an efficient algorithmic technique used in computer science and programming. Essentially, it Master Your Interview Preparation with These 20 LeetCode Two Pointer Questions Background Lately, I’ve been grinding on LeetCode, specifically on two-pointer questions 🚀. If you are In this page, we'll cover: A simple problem that illustrates the motivation behind the two-pointer technique. Learn how it simplifies array and string problems with real-world examples and tips for coding interviews in 2025. zuh5l, rkbd, gx9bk, qm21z, u4bi, 9yufa, digrui, fpzxw, knjw, peotyg,