Two Pointer Technique Problems. Problems include Reversing an array and Find if a pair with

Problems include Reversing an array and Find if a pair with given sum exists in a sorted array. The types of problem for which you should consider using this technique. Trying to get better at problem solving and it seems inefficient to grind leetcode without understanding what lies behind the problems. Learn the two pointers pattern with step-by-step examples, code templates, and LeetCode practice problems. In this guide, we'll cover the basics so that you know when and Nov 7, 2025 · The Two Pointer technique is a pattern built on simple movement and precise logic. Aug 21, 2025 · Core The Two Pointers pattern is a common algorithmic technique used primarily to simplify problems that involve arrays or linked lists. By moving two pointers at different speeds, you can find the middle element in a single pass without extra space. Below is a list of practice problems from Leetcode that can be solved using the two-pointer approach. Dec 21, 2019 · Today we’ll be learning about the Two Pointer approach. We will start with a brute force solution Mar 17, 2025 · The Two Pointers Technique is a straightforward but effective algorithmic technique that uses two pointers to traverse an array or linked list at the same time. Whether it is searching, manipulation, optimization, or comparison, the two-pointer approach excels in various problem-solving scenarios. The first … Jan 13, 2025 · The two-pointer technique is a fundamental and versatile problem-solving strategy that is particularly useful in solving array and string-related problems. However, the second scenario, which is also called slow-pointer and fast-pointer technique, is really useful. This strategy involves the use The Two Pointer technique is a game-changer for problem-solving efficiency. Aug 3, 2022 · Two pointer techniques — a visual tutorial Three animated two-pointer techniques to solve Three different problems. Jul 26, 2025 · What Is the Two Pointers Technique? Two pointers is a pattern where you use two indices (or “pointers”) to traverse an array — either from both ends or from the same direction — to solve a problem more efficiently than brute force. In the last chapter, we have introduced how to use the two-pointer technique in a linked list. Aug 28, 2024 · How to Master Two Pointer Problems: Tips and Resources If you’ve ever delved into coding challenges, particularly in algorithmic interviews or competitive programming, you might have encountered the two-pointer technique. Two Pointer is a classic technique used to solve coding interview problems. The Two Pointers technique is a powerful tool in any programmer’s arsenal, especially when tackling array and string problems. I’ll go through an overview, talk about variations, and teach you how to recognize when to use this technique. Sep 15, 2025 · 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—either toward each other or in the same direction to solve problems more efficiently Level up your coding skills and quickly land a job. io/Code solutions in Python, Java, C++ and JS for this can be found at my GitHub repo here: h Jun 25, 2024 · There are many Leetcode problems you can solve with two pointer technique and its variations. Brute force is dead. Depending on the difficulty, these pointers may go towards, away from, or in the same direction. Jul 23, 2025 · Two pointers is really an easy and effective technique which is typically used for searching pairs in a sorted array. Sep 6, 2023 · The two-pointer technique is a fundamental algorithmic approach that plays a pivotal role in optimizing solutions to specific types of problems in computer science. It’s mostly used when: The array is sorted Oct 17, 2025 · Master DSA Patterns with 2 Pointers Technique Padho with Pratyush 3. Sep 27, 2023 · Mastering the Two-Pointer Algorithm: A Guide When it comes to solving complex problems involving arrays, linked lists, or even strings, the Two-Pointer Algorithm emerges as a powerful technique. Aug 21, 2025 · It helps solve problems that involve searching, sorting, or traversing arrays, strings, or linked lists in an efficient way. If you’re feeling lost when it comes to solving two-pointer problems, you The two-pointer technique is a versatile and efficient strategy commonly used in solving problems on arrays, strings, linked lists, and other data structures. Let’s go through a classic-style problem, explaining the idea, giving a dry run. If you’re still using nested loops to solve pair problems, it’s time to level up. Jul 8, 2025 · By using two pointers to traverse data structures (typically arrays or strings), we can solve complex problems with optimal time complexity, often transforming O (n²) solutions into O (n) 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 pointers and updating them accordingly. When to use the Jan 13, 2022 · Hello, I have been solving all two pointers tagged problems in last 3. Learn step-by-step with examples, visual diagrams, and Python code. 2. Once the array is sorted then we can use this approach by keeping one pointer at the beginning (left) and another at the end (right) of the array. The text suggests that dividing complex problems into smaller subproblems can make them more manageable when using the two-pointer technique. By intelligently moving two pointers instead of using nested loops, you can significantly optimize your approach to Level up your coding skills and quickly land a job. It’s often used for problems involving subarrays, substrings, or sorted arrays where you need to optimize over indices without brute force. Sep 18, 2023 · The two pointer technique is a must-know strategy for technical interview candidates. Sep 3, 2020 · Let's learn about the Two Pointers technique to algorithm templates and two main variations of this technique. Two Pointers – Simplifying Subarrays and Strings the Smart Way Hey Coders! Today, we’ll break down a super useful technique in competitive programming: Two Pointers. It is commonly used when you need The two pointers technique is a powerful strategy used to solve problems on arrays and strings efficiently. 5 months, and wanted to share my findings/classifications here. Hello guys, cheers to another piece of learning. For these questions, each pointer represents where the next element belonging to that region should go. Whether the pointers are moving towards each other or in the same direction, this approach can simplify complex problems and improve the performance of your solutions. The approach in this video will help you solve a wide range of LeetCode style int The two pointer technique is a near necessity in any software developer's toolkit, especially when it comes to technical interviews. 22 hours ago · When starting with the Two Pointer technique, one of the simplest and most important problems is reversing an array without using extra space. This problem builds the foundation for many advanced two-pointer problems. This method is highly efficient when traversing arrays The two-pointer technique can also be used to solve problems that involve partition arrays into different regions. It relies on two reference variables that travel through data at different speeds or directions to find a Aug 6, 2024 · Time Complexity: O (N), where N is the number of nodes in the Linked List. 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. There are around 140 problems today, but I only solved the public ones (117 problems). Sep 15, 2025 · 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—either toward each other or in the same direction to solve problems more efficiently Level up your coding skills and quickly land a job. Jul 23, 2025 · The two-pointer technique is a common technique used in linked list problems to solve a variety of problems efficiently. A list of problems (with animated solutions!) for you to try that build upon the concepts covered here. A simple problem that illustrates the motivation behind the two-pointer technique. This technique is commonly used to solve problems that involve searching for a specific condition or pattern within a data set, or that require a comparison between different elements in the data set. The key is that both pointers only move forward. Dec 1, 2019 · Two Pointer Algorithm For Coding Interview: In this video, I have explained two pointer technique which is the optimal way to solve problems related to arrays, strings and linked list in O (N Sep 5, 2025 · Master the Two Pointer Technique to solve array and string problems efficiently. The pattern works for merging, counting, and sliding window problems. This strategy can be a bit of a head-scratcher for many, leading to frustration and confusion. If you are preparing for Summary Two pointers turn many O(n²) problems into O(n) or O(n + m). Sep 9, 2025 · Basics of Two Pointer The two-pointer technique uses two indices that move towards each other or in the same direction to process data efficiently. The Two Pointers pattern is a common algorithmic technique used primarily to simplify problems that involve arrays or linked lists. The Two-Pointer Technique efficiently solves the "Two Sum Sorted" problem in a sorted array. Jan 26, 2025 · In this video, I talk about the two pointers technique which is a very important DSA topic for coding interviews. Apr 4, 2024 · The two-pointer technique is a widely used approach to solving problems efficiently, particularly scenarios involving arrays or linked lists. Whenever an array question deals with finding two numbers in an array that satisfy a certain condition, either A two-pointer technique helps achieve this efficiently: a 'scan' pointer traverses the heap to identify live objects, while a 'free' pointer keeps track of the next available space to where live objects should be relocated. Sep 4, 2025 · The Two Pointer Technique is a powerful method often used in solving array and string problems efficiently. This technique is an easy and efficient way to improve the performance of our algorithm. 29K subscribers Subscribe This is where the Two Pointers technique shines — it allows you to solve many of these problems in O (n) or O (n log n) time. Finally, I’ll leave you Aug 10, 2024 · The two-pointer technique is a versatile and efficient tool in the world of algorithms, especially when dealing with arrays, strings, and linked lists. In this short, I break down the two pointers technique 5 days ago · 53 likes, 4 comments - deadlockdreams on January 15, 2026: " ️Two Pointer is a scanning technique for arrays or strings, here we use two indexes instead of nested loops. So I'm looking for this kind of algorithm techniques like sliding window ot two pointer approach, so I can focus on one set on the problems at the time. Today I talked why we use 2-Pointer Algorithm! Why do we need them when we have arrays? And I also discussed Dec 9, 2025 · The ultimate comprehensive guide to two pointers. This efficiency boost allows large datasets to be processed faster. Oct 19, 2020 · We have explained two pointer technique which is the optimal way to solve problems related to arrays in O (N) time. Master Data Structures & Algorithms for FREE at https://AlgoMap. Jul 10, 2024 · The two pointers technique is a popular and efficient algorithmic strategy used to solve various problems in computer science, especially in the context of arrays and linked lists. Nov 2, 2025 · What Is the Two Pointer Technique? The Two Pointer approach uses two indices (pointers) to traverse data structures like arrays or strings, usually from opposite ends or at different speeds. Example: Detecting loop in a linked list, checking palindrome in arrays, strings, and linked list, reversing a string or a linked list, two sum problem, finding the middle of a linked list, etc. We need to find pairs/triplets or process subarrays without restarting from scratch. For example, to check if a sorted array Jul 23, 2025 · Two pointers is really an easy and effective technique which is typically used for searching pairs in a sorted array. . Let’s head onto Coding Ninjas Studio and try to code for this problem. LeetCode Problems solved in this video: Thanks for Watching! If you found this video helpful, check other Geekific Jul 23, 2025 · The two-pointer approach is a valuable tool in the programmer, offering a versatile and efficient technique for solving array-related problems. Oct 23, 2024 · The two-pointer technique is a fundamental and highly efficient approach for solving problems that involve searching, sorting, or manipulating arrays and strings. Essentially, it involves using two pointers (or indices) to traverse an array, often with each moving at a different speed or starting position. 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. **What is the Two Pointers Technique? Apr 17, 2023 · Discover the nuances of using 'and' and 'or' conditions with the two pointers technique in LeetCode problems, demonstrated through merging two sorted lists. Dec 21, 2021 · There are more than 130/1300 problems in Leetcode that can be solved using two pointer approach. Jun 20, 2025 · 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. Learn the Two Pointers Technique in Java DSA with introduction, when to use, advantages, examples, and popular problems. It involves initializing two pointers, comparing their sum to the The Find the Middle of a Linked List problem is a classic example of how the Slow and Fast Pointer technique simplifies linked list traversal. By understanding when and how to apply this technique, you can significantly improve the efficiency of your solutions and tackle a wide range of coding challenges with confidence. It involves using two pointers that traverse the linked list at different speeds or in different directions. Given a sorted array A (sorted in ascending order), having N integers, find if there exists any pair of elements (A [i], A [j]) such that their sum is equal to X. The two pointers pattern is a versatile technique used in problem-solving to efficiently traverse or manipulate sequential data structures, such as arrays or linked lists. Apr 12, 2025 · The Two Pointer technique is one of the most intuitive yet powerful problem-solving strategies used in competitive programming and system design questions involving arrays, strings, and linked lists. Overview In this tutorial, we’ll discuss the two-pointer approach for solving problems involving arrays and lists. 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. That’s when the Two Pointer technique comes to the rescue: a space-efficient, intuitive way to traverse arrays or strings for many common problems. If you are preparing for technical interview, two pointers is one of the popular topics that you can't skip :). Instead of juggling multiple indices or iterating in a complex way, these two pointers streamline your scan. The fast and slow pointer (also known as the tortoise and hare approach) is quite a famous two-pointer technique used to determine properties about directed data structures: an array, a single-linked list, or a graph all be used. This approach is particularly useful for solving problems related to searching for pairs Jul 14, 2025 · At its core, the Two Pointers technique is a problem-solving strategy where you use two variables (our "pointers") to efficiently traverse a list or string. Apr 4, 2025 · 1. Dec 8, 2024 · This collection is designed to help you understand and master the Two Pointer Technique, a powerful approach for solving array and string problems efficiently. Mar 17, 2025 · The two-pointer technique improves time complexity for many arrays and linked list problems from O (n^2) using nested loops to O (n) for a single linear scan. It allows solving a class of problems efficiently by using two pointers to iterate through arrays or linked Jul 23, 2025 · Two pointers is really an easy and effective technique which is typically used for searching pairs in a sorted array. Jul 20, 2025 · 📌 What Is the Two-Pointer Technique? The two-pointer technique uses two variables (or "pointers") to scan through a data structure like an array or a string. Check the sum of the elements at these two pointers: Step-by-step walkthrough of LeetCode 125 Valid Palindrome using the two pointer technique. Instead of relying on brute force approaches that may take O (n²) time, the two pointer approach strategically uses two indices (pointers) to traverse the data structure and solve problems in O (n) or O (n log n) time. You can acquaint yourself with how this approach is used. What You’ll Learn: Sep 30, 2024 · The two-pointer technique in Java involves using two indices (or pointers) to traverse an array or a list. Perfect for coding interview preparation. This technique uses two pointers that either move towards each other, away from each other, or in a synchronous manner, to scan the array or list in one or two passes. It involves using two indices that move toward or away from each other based on certain conditions. Technique Description In many problems involving arrays or lists, we have to analyze each element of the array compared to its other Jul 22, 2024 · The two-pointer technique uses two pointers (or indices) that traverse the data at the same time. Jul 26, 2025 · The idea is to use the two-pointer technique but for using the two-pointer technique, the array must be sorted. It is commonly used when: Data is sorted or the problem has sequential properties. As a self-taught developer (no theoretical CS background), learning data … Aug 11, 2020 · Two-pointer technique is commonly used to solve array problems very efficiently. Sep 6, 2023 · Two Pointer Technique Two Pointer Technique is a useful strategy for solving a variety of array-based problems in a more efficient manner. Note: SkillSetMaster is a separate platform with its own courses. In this post, you will be going through 13 problems which kind of sets the tone for the other The author believes that the two-pointer approach is often used for problems with a time complexity requirement, and it is essential to optimize for such. At its core, the idea is simple. You can find a list here… Jan 13, 2022 · Hello, I have been solving all two pointers tagged problems in last 3. Jan 21, 2023 · One of these approaches goes by Two-Pointers and is the subject of this video. Usage: Two pointer approach can be used when you want to process two elements in a single iteration or determine a type of pattern. The Two-Pointer Technique is most commonly used in problems related to arrays and linked lists. Your old 30DaysCoding purchases are accessible via the dashboard link above. Would be grateful for your ideas Many linked list problems can be solved with the two-pointer technique. Level up your coding skills and quickly land a job. Oct 18, 2021 · The Two-Pointer Technique In this second installment of my Algorithms and Data Structures Series, I explain a very common technique used in search algorithms: the two-pointer technique. Boost your coding skills and solve array problems efficiently with O (n) solutions. If it seems like a linked list problem requires keeping track of multiple positions or creating other data representations (such as using an array), consider whether two pointers iterating in parallel or at different speeds could help solve the problem efficiently. 1 day ago · It’s a powerful tool, but as problems grow, relying solely on extra space can be limiting. Master the two-pointer method with interactive visuals and real-time coding exercises to solve array problems efficiently. This approach reduces the need for nested loops and is particularly effective for searching, sorting, and comparing elements in linear time. Learn all variants, when to use each pattern, complete templates in multiple languages, and a systematic approach to solve any two pointers problem. Jan 13, 2022 · Hello, I have been solving all two pointers tagged problems in last 3. We have explained the Two Pointer Technique in array which is used to solve a vast range of problems efficiently. This is the best place to expand your knowledge and get prepared for your next interview. This blog summarizes key LeetCode problems where the two-pointer method not only simplifies the approach but also optimizes performance, especially compared to brute-force solutions. In this chapter, we will focus on slow-pointer and fast-pointer problem in the linked list and show you how to solve this problem. Jan 7, 2024 · This blog aims to shed light on the significance of understanding and applying specific problem-solving techniques during interview prep, focusing on the invaluable Two Pointer technique. In arrays, it's often employed to find pairs of elements that meet certain conditions.

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