Two Pointer Pattern Explained. It contains well written, well thought and well explained computer

It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. This tutorial will delve into how this technique operates, its benefits, and how to implement it to solve common coding challenges effectively. Learn how it simplifies array and string problems with real-world examples and tips for coding interviews in 2025. c. Sep 15, 2025 · Master the Two Pointers Pattern: Your Key to Acing DSA Interviews Ever wondered how top programmers solve array problems so elegantly? The secret weapon is the Two Pointers technique. You may assume that each input would have exactly one solution, and you may not use the same element twice. Overall, the two pointers technique is a useful approach for solving specific types of problems that involve iterating through a data set in a controlled way, such as in pattern matching, data analysis, and statistics. Mar 17, 2025 · The two-pointer technique uses two-pointers or variables to iterate through a data structure, typically an array or linked list. How It Works Schedule a 1:1 session with me: https://topmate. Includes detailed explanations, problem links, and clear strategy breakdowns for both fixed-size and variable-size window problems. In this technique pointers represent either index Apr 26, 2022 · Two pointer algorithm pattern is one of the most commonly asked questions in any programming interview. As you saw in Chapter 15, where smart pointers made multiple ownership possible, multiple ownership can add complexity because these different owners need managing. This approach optimizes the runtime by utilizing some order (not necessarily sorting) of the data. Feb 8, 2024 · The two-pointer technique is a pattern where two pointers iterate over the data structure in together or separately until they satisfy a certain condition. com/channel/UCT-S2ngqEBoYCM5UKuNeELg/ Introduction to Two Pointers Intuition As the name implies, a two-pointer pattern refers to an algorithm that utilizes two pointers. Floyd’s Tortoise and Hare Algorithm) which is very useful when dealing with cyclic Linked Lists or Arrays. And once you master it, you'll solve an entire class of problems in minutes. 722,935 views • Mar 26, 2024 • Two Pointer and Sliding Window Playlist | Language Independent Course Iterating two monotonic pointers across an array to search for a pair of indices satisfying some condition in linear time. You will find the question leetcode link in the sheet. Two Sum - Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. Here is explained 6 problems related to it. 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. Master the two-pointer method with interactive visuals and real-time coding exercises to solve array problems efficiently. This strategy involves the use Jul 23, 2025 · Your All-in-One Learning Portal. Sep 3, 2020 · Let's learn about the Two Pointers technique to algorithm templates and two main variations of this technique. Now, if you want to get good at Two Pointers, please checkout my Two Pointers playlist. Feb 28, 2021 · Move Zeroes and questions that are similar to this Two Pointers. This is the best place to expand your knowledge and get prepared for your next interview. By moving at different speeds, the algorithm proves that the two pointers are going to meet eventually. By understanding the Two-Pointer Technique, you can code more efficiently, thereby reducing the time and space complexity of your algorithms. io/Code solutions in Python, Java, C++ and JS for this can be found at my GitHub repo here: h Level up your coding skills and quickly land a job. Jul 14, 2025 · Master the Two Pointers technique with practical Python and JavaScript examples designed to help you ace technical interviews. Mar 31, 2023 · The Two Pointer algorithm uses two pointers to iterate an array or list until conditions are met. Jul 23, 2025 · Time Complexity: O (n2) Auxiliary Space: O (1) Now let’s see how the two-pointer technique works. The AKC is the recognized and trusted expert in breed, health and training information for dogs. Using this pattern, you can solve multiple ar A free collection of curated, high-quality competitive programming resources to take you from USACO Bronze to USACO Platinum and beyond. Nov 27, 2021 · Coding Pattern Two Pointer It is the course for Learning Coding Pattern, that can help you to crack any technical interview in @amazon @Google @Facebook @Microsoft @Twitter @Scalac @Scala in the Master DSA Patterns: https://algomaster. k. Jun 21, 2021 · However, whereas binary search locates a single element within a collection, the two pointers technique is used to locate two elements within an array that together meet a condition. I’ll do my best to explain it in a simple way and leave you with This is why the two-pointer technique is efficient. Dec 11, 2022 · How to use fast and slow pointer technique to solve a pattern of problems of linked list. length. Use this pattern when dealing with sorted arrays or lists where you need to find pairs that satisfy a specific condition. Jan 7, 2024 · Two pointers: Start and End ² 👀 Recognizing When to Use Two Pointers Identifying when to leverage the Two Pointer technique is a key aspect of mastering efficient problem-solving. Traverse the first linked list using the pointer p until you reach the end. Dec 1, 2025 · In this guide, we'll dive deep into the two pointer pattern. Aug 6, 2024 · Two Pointers is a pattern in which two pointers iterate across the Data Structure until one or both of them satisfy the necessary condition. We'll explore the core concepts, implementation details, common pitfalls, and real-world interview applications. Nov 24, 2023 · Fast and slow pointers are a common pattern used in algorithmic problem-solving, particularly in linked list and two-pointer problems. Finding the Intersection Point of Two Linked Lists: To find the intersection point of two linked lists using the two-pointer technique, follow these steps: Initialize two pointers, p and q, to the heads of the two linked lists, respectively. In problems where we deal with sorted arrays (or Linked List) and need to find a set of elements that fulfill certain constraints, the Two Pointers approach becomes quite useful. Two pointer is very hard because it’s technically a greedy algorithm. Aug 21, 2025 · The Two Pointers pattern is a common algorithmic technique used primarily to simplify problems that involve arrays or linked lists. The Two Pointer Technique is a powerful algorithmic strategy used for a variety of problems in Java, particularly in arrays and strings. By using two pointers to traverse data structures (typically arrays or strings), we can takeuforward is the best place to learn data structures, algorithms, most asked coding interview questions, real interview experiences free of cost. Common patterns in the two-pointer approach entail: Two pointers, each starting from the beginning and the end until they both meet. 06K subscribers Subscribed 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 Two Pointer Technique Made Easy | Important Two Pointer Problems Solved Step by Step 2023 Data Structures Explained for Beginners - How I Wish I was Taught The two-pointer technique I’m referring to here involves using two pointers that start at opposite ends of an array and gradually move towards each other before meeting in the middle. youtube. L1. The two pointer and sliding window techniques are widely used algorithmic approach in computer science and programming. (Here, pointers are basically array indexes). Most of these questions seem solvable without swapping but it never passes test cases. Jul 23, 2025 · 5. Im currently trying to learn common patterns within leetcode and other interview problems. This algorithm is used to find a loop in a linked list. 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. Learn these patterns with me to master Data structures and algorithms. We would like to show you a description here but the site won’t allow us. The approach in this video will help you solve a wide range of LeetCode style interview problems. Master Two Pointers & Sliding Window Techniques Solve 25+ handpicked LeetCode problems using two of the most powerful patterns in DSA. 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) ones. This is because two pointers can easily track the start and end of the window. This pattern is extremely useful when dealing with linear data structures such as arrays, linked lists, or strings. Single-slit diffraction Graph and image of single-slit diffraction Single-slit diffraction pattern produced by a blue laser beam. It is particularly useful for solving problems involving sorted arrays, partitions, or paired comparisons. The Two Pointers pattern is a coding technique used to solve problems involving arrays or sequences by using two pointers that move through the array simultaneously. (Not talking about linked list fast/slow pointer) Greedy algorithms are hard to identify and prove. For example, there are problems where it initially looks like sliding window (two pointer variation) is the solution, but then you see that the greedy property fails. 2 Pointers: The Squeeze The 2 pointers technique is a versatile pattern often used to reduce time complexity from quadratic to linear. This approach is generally used to search pairs in a sorted array. But what exactly is the Two-Pointer Technique? It is a method where two pointers traverse through an array or list, often moving towards each other, to solve a specific problem. It leverages two indices to traverse a data structure, typically an array or a string Apr 1, 2022 · Concept Introduction Two pointer approach is an essential part of a programmer’s toolkit, especially in technical interviews. This article is designed to offer you a comprehensive insight into the utility of the Two-Pointer Technique for streamlining and enhancing solutions for typical array challenges. b. Dec 9, 2025 · Two pointers is one of the most powerful patterns in algorithmic problem solving. a. 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. One such pattern is the “Two Pointers” 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. Oct 21, 2019 · In Coding Patterns series, we will try to recognize common patterns underlying behind each algorithm question, using real examples from Leetcode. The name does justice in this case, it involves using two pointers to save time and space. 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. Nov 27, 2021 · Coding Pattern Two Pointer It is the course for Learning Coding Pattern, that can help you to crack any technical interview in @amazon @Google @Facebook @Microsoft @Twitter @Scalac @Scala in the Oct 17, 2025 · DSA Patterns are the way to crack coding rounds and interviews of top companies. Whether you’re just getting started or optimizing complex GPU kernels, this guide is an Sep 6, 2023 · Among the various approaches to solving array problems, the Two-Pointer Technique stands out as a frequent and effective pattern. io/nikoo28Join this channel to get access to perks: https://www. It's used in hundreds of LeetCode problems. Schedule a 1:1 session with me: https://topmate. 2 pointer pattern is one of the most common and powerful algorithms in data structures and algorithms. Jul 23, 2025 · Floyd's cycle finding algorithm or Hare-Tortoise algorithm is a pointer algorithm that uses only two pointers, moving through the sequence at different speeds. Many algorithms just use a single pointer to attain or keep track of a single element: The Two Pointers pattern is a common algorithmic technique used primarily to simplify problems that involve arrays or linked lists. I’ll do my best to explain it in a simple way and leave you with Nov 24, 2023 · Fast and slow pointers are a common pattern used in algorithmic problem-solving, particularly in linked list and two-pointer problems. Comparing the letters at two indices can yield two outcomes. We will start with a brute force solution Can you solve this real interview question? Two Sum II - Input Array Is Sorted - Given a 1-indexed array of integers numbers that is already sorted in non-decreasing order, find two numbers such that they add up to a specific target number. By the end, you'll be well-equipped to recognize and apply this pattern to solve a wide range of coding challenges. Jul 8, 2025 · The two-pointer technique is one of the most elegant and efficient algorithmic patterns in computer science. The two pointer technique is a near necessity in any software developer's toolkit, especially when it comes to technical interviews. Don’t worry; the "two pointer technique" has a limited set of concepts. For some reason I keep getting confused about the swap part of the two pointer technique. Dec 21, 2019 · Remember earlier we said two pointers were useful to look at 2 different indices of the input to make a decision. 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. To set the Time signature use the Project General Settings. But what is a pointer? It's a variable that represents an index or position within a data structure, like an array or linked list. Nov 11, 2024 · Two-pointers can definitely be tricky sometimes! I just want you to know that it’s completely normal to feel confused about it. Handle edge cases: Always consider edge cases such as empty lists or lists with only one or two nodes. 2. The fast pointer typically moves faster than the slow pointer. Explain your approach: Clearly explain the intuition behind using two pointers and how they help solve the problem efficiently. This technique is useful because it allows us to keep track of two values and different indexes in Jul 11, 2023 · The two-pointer technique is a pattern where two pointers iterate over the data structure in tandem or separately until they satisfy a certain condition. Oct 23, 2019 · Previous posts were about Sliding Window and Two Pointers patterns and today, we will introduce Fast & Slow Pointers pattern (a. #dsa #dsaforbeginners #dsapatterns …more Mar 27, 2025 · Subscribed 1 1 waiting Premieres Mar 27, 2025 00:00 - Two Pointer Pattern Explained 09:53 - Q1 - Move Duplicates to the Endmore Live chat Master Two Pointers & Sliding Window Techniques Solve 25+ handpicked LeetCode problems using two of the most powerful patterns in DSA. If a cycle exists, the two pointers will eventually meet during traversal. It is used to solve problems that can be efficiently solved by maintaining two positions or indices in a sequence or array. Written by top USACO Finalists, these tutorials will guide you through your competitive programming journey. Sliding window optimization is a technique that combines hashing and two pointers to improve the performance of the sliding window algorithm. One pointer moving at a slow pace, while the other pointer moves at twice the speed. com/channel/UCT-S2ngqEBoYCM5UKuNeELg/ Jul 26, 2025 · 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. What Is the CUDA C Programming Guide? The CUDA C Programming Guide is the official, comprehensive resource that explains how to write programs using the CUDA platform. Jul 21, 2024 · The Two Pointers pattern involves using two pointers to iterate through an array or list, often used to find pairs or elements that meet specific criteria. 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. Jul 19, 2024 · In the world of coding interviews, certain patterns appear frequently. Return the indices of the two numbers, index1 Jul 23, 2025 · Your All-in-One Learning Portal. In this guide, we'll cover the basics so that you know when and 15 Leetcode Patterns 20 DP Patterns Two Pointers Pattern Sliding Window Pattern Prefix Sum Pattern Fast and Slow Pointers Pattern Top 'K' Elements Pattern Kadane's Algorithm Linked List In-place Reversal Pattern Monotonic Stack Pattern Overlapping Intervals Pattern Backtracking Pattern Modified Binary Search Pattern Tree Patterns Tree Iterative Master Data Structures & Algorithms for FREE at https://AlgoMap. Master the Two Pointers technique used in algorithmic problem-solving. Discover the power of the two-pointer technique in solving LeetCode problems! This guide explores how two pointers can optimize arrays, strings, and linked lists, reducing time complexity and enhancing efficiency. Two pointer algorithm is one of the most commonly asked questions in any programming interview. To change the tempo of individual patterns, edit the Piano roll data and or number of Stepsequencer steps for that Pattern so the new tempo is achieved. This approach is versatile and can be used to solve a variety of Handle edge cases: Always consider edge cases such as empty lists or lists with only one or two nodes. It transforms O (n²) brute force solutions into O (n) optimal ones. Let these two numbers be numbers[index1] and numbers[index2] where 1 <= index1 < index2 <= numbers. This pattern involves maintaining two pointers that traverse a data structure (like an array or linked list) at different speeds. Two pointers is another common technique for tracking the elements in a sliding window. Could someone help me understand the reason? The two-pointer technique is a powerful and versatile strategy often employed in algorithmic problem-solving. The key idea is that the pointers start at different positions and move in a coordinated way to traverse the data structure efficiently. Numerical approximation of diffraction pattern from a slit of width four wavelengths with an incident plane wave. Due to the different speeds of the pointers, this pattern is also commonly known as the Hare and Tortoise algorithm, where the Hare is the fast pointer while Tortoise is the slow pointer. In this blog, we’ll break it down step by step with examples, Java code, and interview patterns. Let’s go over the Two Pointers pattern, its real-world applications, and some problems we can solve with it. 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. Apr 17, 2021 · Two are better than one if they act as one. The main central beam, nulls, and phase reversals are apparent. Oct 18, 2021 · The first clue that a two-pointer approach might be needed is that the problem asks for a set of elements — that fit a certain pattern or constraint — to be found in a sorted array or linked list. io/In this video, I talk about Fast and Slow Pointers LeetCode Pattern. Two Pointers || 25 DSA Patterns || New & Easy way to Master DSA || Crack DSA round|| Crack FAANG A curated list of leetcode questions grouped by their common patterns Jul 11, 2023 · The two-pointer technique is a pattern where two pointers iterate over the data structure in tandem or separately until they satisfy a certain condition. We take two pointers, one representing the first element and other representing the last element of the array, and then we add the values kept at both the pointers. This approach works in constant space. We are able to process two elements per loop instead of just one. Usage: Two pointer approach can be used when you want to process two elements in a single iteration or determine a type of pattern. Two Pointer is a classic technique used to solve coding interview problems. The slow pointer moves one step at a time, while the fast pointer moves by two steps. Master the 'Merge Two Sorted Linked Lists' problem! Learn the two-pointer and recursive solutions with clear explanations, code examples, and edge case handling. Master this versatile method for coding interviews and beyond. Jan 26, 2025 · Two Pointers in 7 minutes | LeetCode Pattern AlgoMasterIO 9. . This is why the two-pointer technique is efficient. Apr 9, 2023 · "Unlock the secrets of the Fast & Slow Pointer technique in this ultimate coding tutorial! 💡 Ace your next FAANG interview with these 3 essential examples, Oct 19, 2020 · We have explained two pointer technique which is the optimal way to solve problems related to arrays in O(N) time. 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