Two Pointers Approach. Sep 3, 2020 · Let's learn about the Two Pointers technique

Sep 3, 2020 · Let's learn about the Two Pointers technique to algorithm templates and two main variations of this technique. Two pointer algorithm is one of the most commonly asked questions in any programming interview. Feb 11, 2024 · A comprehensive guide to the Two Pointer Approach! Explore its benefits, types, problem-spotting tips, and real-world examples for mastering this versatile strategy. As a self-taught developer (no theoretical CS background), learning data … Explore and run machine learning code with Kaggle Notebooks | Using data from No attached data sources Oct 3, 2023 · The two-pointer technique is one of those techniques. By utilizing two pointers either moving towards each other or in the same direction, we can reduce the time complexity of many problems from O (n2) to O (n) or O (nlog⁡n). Another variation to this problem is when the first pointer begins at the beginning while the second pointer begins at the end. The more efficient an algorithm, the faster it can provide real-time insights, which is crucial in sectors like finance where time-sensitive decisions are the norm. This type of two-pointer technique is particularly useful in scenarios where you want to find a pair of elements that meet certain conditions or when comparing elements from both ends. This approach is best demonstrated through a walkthrough, as done below. Oct 15, 2019 · Description Discussion This tutorial delve into the powerful Two Pointer Approach. Generally speaking, a two pointer algorithm has these characteristics: Two moving pointers, regardless of directions, moving dependently or independently; A function that utilizes the entries referenced by the two pointers, which relates to the answer in a way; An easy way of deciding which pointer to move; Generally speaking, a two pointer algorithm has these characteristics: Two moving pointers, regardless of directions, moving dependently or independently; A function that utilizes the entries referenced by the two pointers, which relates to the answer in a way; An easy way of deciding which pointer to move; Let’s go over the Two Pointers pattern, its real-world applications, and some problems we can solve with it. This approach reduces the need for nested loops and is particularly effective for searching, sorting, and comparing elements in linear time. Jan 12, 2021 · This blog explains the Array Two Pointer approach and covers a few questions from LeetCode that could be solved using the same. Let’s go through a classic-style problem, explaining the idea, giving a dry run. Jan 21, 2023 · One of these approaches goes by Two-Pointers and is the subject of this video. 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 pointers is really an easy and effective technique that is typically used for Two Sum in Sorted Arrays, Closest Two Sum, Three Sum, Four Sum Jul 8, 2025 · The two-pointer technique is one of the most elegant and efficient algorithmic patterns in computer science. See examples, code, and suggested problems for practice. LeetCode Problems solved in this video: Thanks for Watching! If you found this video helpful, check other Geekific Sep 4, 2025 · The Two Pointer approach usually works in O (n) time since each pointer typically moves at most n steps. Efficieant Approach (Two Pointer Approach): Now let’s see how the two-pointer technique works. By using two pointers to traverse data structures (typically arrays or strings), we can The two-pointer technique is an efficient approach to processing two elements of a data structure, such as an array or list, per loop in order to solve problems involving collections. Two Pointer approach What is the two pointer approach? As the name suggests, a two-pointer approach uses two-pointers to find the answer to a problem in the optimal time. txt) or read online for free. The "two-pointer technique" only uses a small number of concepts, so don't worry. This problem builds the foundation for many advanced two-pointer problems. In the two pointer approach, one variable will be pointing at the starting index and another variable will be pointing at the ending index. Additionally, it is a simple approach that, when applied correctly, is extremely powerful. Mar 17, 2025 · The two-pointer approach on arrays minimizes repeated linear scans and unnecessary nested loops. An example of the fast and slow pointer approach is illustrated below. Two Pointer - Free download as PDF File (. Now we add them and check if the sum value is equal to the key. Jul 23, 2025 · The two-pointer approach involves using two pointers (indices or references) to traverse an array or sequence. Oct 18, 2021 · In this case, tandem pointers or a fast and slow pointer approach will likely serve to solve the problem. The left pointer traverses from the start toward the end until it points to 1. It involves using two pointers or indices to solve problems by maintaining multiple positions in a sequence or array, often reducing time complexity and optimizing solutions for various coding challenges. Common patterns in the two-pointer approach involve: Two pointers each starting from the beginning and the end until they both meet One pointer moves at a slow pace while the other pointer moves at a faster pace Both of the above patterns can help Jul 26, 2025 · [Better Approach 2] Sorting and Two-Pointer Technique - O (n × log (n)) time and O (1) space The idea is to use the two-pointer technique but for using the two-pointer technique, the array must be sorted. Oct 3, 2023 · The two-pointer technique is one of those techniques. Elevate your coding skills and tackle diverse challenges with ease How could I sort an array with two pointer techinuque for linear time complexity O (N) ? Question Sep 3, 2020 · Let's learn about the Two Pointers technique to algorithm templates and two main variations of this technique. Jul 23, 2025 · Time Complexity: O (n2). It helps convert messy nested loops into clean, optimized solutions. Traverse the first linked list using the pointer p until you reach the end. This approach optimizes the runtime by utilizing some Apr 4, 2024 · The two-pointer technique is a widely used approach to solving problems efficiently, particularly scenarios involving arrays or linked lists. It involves using two indices that move toward or away from each other based on certain conditions. pdf), Text File (. Two pointers run through the data structure in the two-pointer pattern until one or both meet the required criteria. 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. Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview. What is the two pointer approach? As the name suggests, a two-pointer approach uses two-pointers to find the answer to a problem in the optimal time. In problems involving sorting plus two pointers, the complexity may be O (n log n). By using pointers, we can process two elements per loop, instead of just one. Two-pointer Strategies Two-pointer algorithms usually take only O (n) O(n) time by eliminating the need for nested for-loops. This method is highly efficient when traversing arrays Aug 10, 2024 · This approach involves two pointers starting from opposite ends of the data structure and moving toward each other, meaning the pointers move in opposite directions. Apr 4, 2025 · In the two-pointer approach, pointers refer to an array’s indexes. It will cover the theory behind the approach, provide step-by-step examples, and discuss its time and space complexity. Aug 3, 2022 · Two pointer techniques — a visual tutorial Three animated two-pointer techniques to solve Three different problems. It can be visualized as below: Now we got 2 elements from the 2 pointers. 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. 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 powerful and efficient technique used to solve problems involving sorted arrays, searching, and optimization. Learn how this technique can be used to solve a variety of algorithmic problems, especially those involving arrays or linked lists. Your old 30DaysCoding purchases are accessible via the dashboard link above. Follow for more such content @code_chunkx #java #python #javascript #programmer #developer #basic #learningcoding #learning #coding #coderslife #developerlife #development #coder #programming #javadeveloper #javalanguage #vscode #cpp #clanguage #computerengineering #computerscience # . 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 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. The name does justice in this case, it involves using two pointers to save time and space. The pointers typically move at different speeds or in different directions, allowing for efficient traversal and comparison. The two pointer method is a helpful technique to always keep in mind when working with strings and arrays questions. The two pointer approach is an efficient algorithmic technique used in computer science and programming. Dec 18, 2019 · Two pointer approach is an essential part of a programmer’s toolkit, especially in technical interviews. There are three main strategies for using two pointers. By the end of this video, you’ll not only understand the logic but also learn how to identify when to use the Two Pointer approach and implement it with confidence in real interviews. in terms of an array, vector, linked list, etc we can use this approach. By leveraging the relationship between two pointers as they converge or diverge, efficient array algorithms can be designed. Jul 23, 2025 · 5. 4 days ago · Approach 2: Two-Pointer Approach (Optimized) This approach leverages the fact that both input arrays are already sorted to perform the merge efficiently without a full sort at the end. Common patterns in the two-pointer approach involve: Two pointers each starting from the beginning and the end until they both meet Jan 21, 2023 · One of these approaches goes by Two-Pointers and is the subject of this video. Problem: Minimum size subarray sum Sep 27, 2023 · When it comes to solving complex problems involving arrays, linked lists, or even strings, the Two-Pointer Algorithm emerges as a powerful technique. Optimized approach using two pointers To solve this problem, we use an array and two pointers, left and right. It's a clever optimization that can help reduce time complexity with no added space complexity (a win-win!) by utilizing extra pointers to avoid repetitive operations. Aug 6, 2024 · The two types of pointers in two pointer approach are slow and fast pointers. Master the Two Pointers technique used in algorithmic problem-solving. ⸻ 🚀 Aug 22, 2025 · The Two-Pointer approach is one of the most underrated but effective strategies for problem-solving in DSA. Let’s go over the Two Pointers pattern, its real-world applications, and some problems we can solve with it. 888 likes, 13 comments - code_chunkx on November 13, 2024: "Reverse an Array Using Two Pointer Approach. Jul 23, 2025 · Two pointers is really an easy and effective technique which is typically used for searching pairs in a sorted array. 1 day ago · When starting with the Two Pointer technique, one of the simplest and most important problems is reversing an array without using extra space. Inward traversal This approach has pointers starting at opposite ends of the data structure and moving inward toward each other: Nov 28, 2025 · At its core, the two pointer technique involves using two variables (pointers) to traverse a data structure—typically an array or string—in a coordinated way. 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. Whenever an array question deals with finding two numbers in an array that satisfy a certain condition, either 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. Using a two-pointer approach can expedite these calculations, thereby saving both computational resources and time. The right pointer moves from the end toward the start until it points to 0. Learn how to use two pointers technique to iterate through a data set in a controlled way and solve problems that involve searching, comparing, or finding patterns. In problems where we deal with sorted arrays (or linked-lists) and need to find a set of elements that fulfill certain constraints, the Two Pointers approach Apr 17, 2021 · Two are better than one if they act as one. Instead of using nested loops (O (n²)), two pointers often reduce the time complexity to O (n). The two pointers technique is a powerful strategy used to solve problems on arrays and strings efficiently. Learn how it simplifies array and string problems with real-world examples and tips for coding interviews in 2025. When the given data is present in a linear form i. Aug 21, 2025 · The two pointer technique is one of the most common and powerful patterns used in competitive programming, data structures, and algorithms. Note: SkillSetMaster is a separate platform with its own courses. This algorithmic approach involves managing 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. It helps solve problems that involve searching, sorting, or traversing arrays, strings, or linked lists in an efficient way. Jan 26, 2025 · In this video, I talk about the two pointers technique which is a very important DSA topic for coding interviews. Aug 11, 2020 · Two-pointer technique is commonly used to solve array problems very efficiently. 📝 Must-Read Leetcode Articles Sliding Window Template Two Pointers Patterns Collections of Important String Questions Substring Problem Template Binary Search Template A General Approach to Backtracking Questions Monotonic Stack Template Heap Patterns Bit Manipulation Patterns Dynamic Programming Patterns Stock Series Patterns Jul 23, 2025 · Two pointers is really an easy and effective technique which is typically used for searching pairs in a sorted array. It’s often used for problems involving subarrays, substrings, or sorted arrays where you need to optimize over indices without brute force. e. The naive approach to this problem uses two-pointers i and j in a nested for-loop to consider each pair in the input array, for a total of O (n 2) pairs considered. Whenever an array question deals with finding two numbers in an array that satisfy a certain condition, either Dec 22, 2024 · Now we shall try with 2 pointers approach. 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.

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