Two Pointer Approach Leetcode. This method is highly efficient when traversing arrays Jan 29, 2024

This method is highly efficient when traversing arrays Jan 29, 2024 · Two Pointer 🚀| Summary with practice questions Sheet (C++) on LeetCode Hi, my name is Mahesh. Mar 20, 2025 · Mastering the 2-Pointers Approach: A Comprehensive Guide Step-by-Step Solutions to Boost Your Problem-Solving Skills In this article, we’ll solve some leetcode questions for two pointers / … Nov 11, 2024 · 6- Many two-pointer problems ask for optimized time complexity, so if a brute-force solution feels too slow (O (n²)), two pointers might be a good fit for an O (n) approach. com/channel/UCT-S2ngqEBoYCM5UKuNeELg/ Master the powerful Two Pointer Technique 🔥 — one of the most efficient strategies for solving problems on arrays, strings, and more. Boost your coding interview skills and confidence by practicing real interview questions with LeetCode. If you are preparing for 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. Jan 7, 2024 · Beyond the Basics: A Comprehensive Guide to the Two Pointer Approach for Advanced Problem Solving 🔓 Unlocking Strategic LeetCode Success In the competitive landscape of technical interviews … Jan 13, 2022 · Hello, I have been solving all two pointers tagged problems in last 3. Jan 13, 2022 · Hello, I have been solving all two pointers tagged problems in last 3. Two-Letter Card Game is LeetCode problem 3664, a Medium level challenge. Level up your coding skills and quickly land a job. The idea would be to have one pointer for iterating the array and another pointer that just works on the non-zero elements of the array. Remove Duplicates from Sorted Array in Python, Java, C++ and more. Let's briefly review this technique. Slow and Fast Pointers (e. Another pointer (fast) moves two steps (or more) at a time. Jul 22, 2024 · The two-pointer technique uses two pointers (or indices) that traverse the data at the same time. We need to modify the array in-place and the size of the final array would potentially be smaller than the size of the input array. 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. 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. Solutions and general notes for the Leetcode 75. This is the best place to expand your knowledge and get prepared for your next interview. linkedin. Learn all variants, when to use each pattern, complete templates in multiple languages, and a systematic approach to solve any two pointers problem. Sum of Square Numbers #leetcode #viralshorts #shorts Abinaya 254 subscribers Subscribe Approach: 🙃 Sorted the input array to simplify duplicate handling. LeetCode Problems solved in this video: Thanks for Watching! If you found this video helpful, check other Geekific May 24, 2019 · Two-pointer is a quite common method used to solve Leetcode problems related to strings, arrays and linked lists. Contribute to lpalad/Python_Leetcode_75 development by creating an account on GitHub. Our platform offers a range of essential problems for practice, as well as the latest questions being asked by top-tier companies. Let’s push them to the end while maintaining the relative order of non-zero elements! 🔥 Efficient Two-Pointer Approach Time Complexity: O (n) Space Complexity: O (1) 💡 Interview Tip: This problem tests your ability to optimize in-place modifications—an essential skill for coding rounds! Have you solved this before? Jan 29, 2024 · Two Pointer 🚀| Summary with practice questions Sheet (C++) on LeetCode Hi, my name is Mahesh. In this video, we expla Arrays and Strings, coding interview preparation, Data Structures/ Leetcode, Leetcode Top 150, Two Pointer Technique [Problem Solving] Remove duplicates in a sorted array in-place Jul 23, 2025 · The Two Pointer Approach is a powerful and efficient technique used to solve problems involving sorted arrays, searching, and optimization. The entire logic for reversing a string is based on using the opposite directional two-pointer approach! Day 13 💥| LeetCode Two Pointer in Tamil | 633. 🧠 LEETCODE CONSISTENCY SERIES 🚀 Day 9️⃣ of 365 Days 🔁 📘 Topic: Two Pointers 🧩 Problem: Container With Most Water (LeetCode #11) ⏱ Time Taken: ~25 minutes 💡 Key Idea 🧠 LEETCODE CONSISTENCY SERIES 🚀 Day 9️⃣ of 365 Days 🔁 📘 Topic: Two Pointers 🧩 Problem: Container With Most Water (LeetCode #11) ⏱ Time Taken: ~25 minutes 💡 Key Idea DSA Journey – Day 13 🚀 LeetCode 713 – Subarray Product Less Than K Approach: Solved using the sliding window (two-pointer) technique. If you are preparing for As the name suggests, the two-pointer approach can be used to help process two elements per loop, instead of just one. 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. pdf), Text File (. You can find a list here… The two-pointer technique is a versatile and efficient strategy commonly used in solving problems on arrays, strings, linked lists, and other data structures. Feb 29, 2024 · LeetCode Meditations — Chapter 2: Two Pointers One of the techniques of iterating through an array is the two pointers technique, and it is as simple as it sounds: we just keep two pointers, one starting from the left, and the other from the right, gradually getting closer to each other. Apr 4, 2024 · The two-pointer technique is a widely used approach to solving problems efficiently, particularly scenarios involving arrays or linked lists. You may be thinking, why can't we generate the squares and then sort the result? This approach would take O ( N l o g N ) , and we want to do better than this. Simple, right?! We use these multiple pointers to keep track of multiple indices of our input. Oct 30, 2023 · Dive into the Two Sum problem from LeetCode using C#. Q: Should I always use sliding window for substring problems? A: Not always. I’ve been really obsessed with it. Problem: Given two lists of closed intervals, each list is pairwise disjoint (no overlaps within a list) and sorted. The approach in this video will help you solve a wide range of LeetCode style int Arrays and Strings, coding interview preparation, Data Structures/ Leetcode, Leetcode Top 150, Two Pointer Technique [Problem Solving] Remove duplicates in a sorted array in-place Schedule a 1:1 session with me: https://topmate. Aug 31, 2025 · LeetCode Container With Most Water: 2 Approaches Explained A deep dive into one of the most elegant two-pointer algorithm problems Problem Statement Given an integer array height of length n, where … Apr 3, 2025 · Since we are given that vector is sorted we can use that, and also use 2 pointer approach, one in front, one at the end of vector. Skip characters when a * is found by moving the pointer back. I have The process continues until the pointers meet or cross. This method is highly efficient when traversing arrays Arrays-Two-Pointers-LeetCode-Challenges My solution to LeetCode Two-Pointers challenges This repository contains solutions to various LeetCode problems related to arrays and Two-Pointers. I’ll go through an overview, talk about variations, and teach you 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. Perfect for coding interview preparation. We first set a left_pointer at the left of the list and a right_pointer at the right of the list. I found some lists such as These Tips from Sean Prashad however I still find myself having to guess most of the time. Jun 12, 2024 · In summary, the two-pointer technique is a powerful and efficient method for solving the Two Sum problem, as well as many other problems involving pairs of elements in a list. 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). One, that would keep track of the current element in the original array and another one for just the unique elements. 18 hours ago · Q: What's the difference between sliding window and two pointers? A: Sliding window is a specific application of the two-pointer technique. Includes detailed explanations, problem links, and clear strategy breakdowns for both fixed-size and variable-size window problems. In this video, I solve the Remove Element problem from LeetCode using an in-place two pointer approach 🚀This problem is a great example of how to:Modify arr Finally, build the result from the stack. I maintained a window with a running product of 🌟 Day 10/30 – Two Sum II (Input Array Is Sorted) Approach: Used two pointers on the sorted array. Jan 26, 2025 · Two Pointers in 7 minutes | LeetCode Pattern AlgoMasterIO 9. Better than official and forum solutions. It allows for an efficient and controlled iteration of a data set, which can lead to improved performance and more accurate 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 Dec 21, 2019 · Welcome to the first post in my series, Leetcode is Easy! Introduction Today we’ll be learning about the Two Pointer approach. Below is a list of practice problems from Leetcode that can be solved using the two-pointer approach. Apr 1, 2022 · Two pointer approach is an essential part of a programmer’s toolkit, especially in technical interviews. Explore various solutions, from brute force to hash map approaches, and understand their complexities. A more and elegant approach is the fast and slow pointer technique also known as Floyd Cycle Detection algorithm think of it like two people running on a track one running fast and one running slow if the track is a circle no matter where they start the faster runner will eventually catch up to the slower one it's exactly the same in a linked 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. 5 months, and wanted to share my findings/classifications here. I have 🚀 https://neetcode. Example Walkthrough 2: Interval List Intersections (LeetCode 986) This problem demonstrates the two-pointer approach with two sorted interval lists. 🔹 Approach 2 (Two Pointers): Maintain a write pointer to overwrite characters in place. Jun 25, 2024 · There are many Leetcode problems you can solve with two pointer technique and its variations. Time & space complexity: Level up your coding skills and quickly land a job. Learn the two pointers pattern with step-by-step examples, code templates, and LeetCode practice problems. You can find a list here… Arrays-Two-Pointers-LeetCode-Challenges My solution to LeetCode Two-Pointers challenges This repository contains solutions to various LeetCode problems related to arrays and Two-Pointers. No matter if you are a beginner or a master, there are always new topics waiting for you to explore. Learn algorithms, data structures, and coding interview strategies. LeetCode 67 – Add Binary Solved using a two-pointer approach from the end of both binary strings, manually handling carry and edge cases without built-in conversions. Ideal for college-level CS students. I have solved more than 500+ questions on LeetCode and have current ratings of 1572 . ). Level up your coding skills and quickly land a job. Apr 3, 2025 · Since we are given that vector is sorted we can use that, and also use 2 pointer approach, one in front, one at the end of vector. Two pointers is more general (can move independently), while sliding window maintains a contiguous segment with specific properties. Depending on the difficulty, these pointers may go towards, away from, or in the same direction. A two-pointer approach could be helpful here. Jun 14, 2024 · Two Pointers The Two Pointers technique is a fundamental and versatile approach used to Tagged with algorithms, datastructures, coding, interview. Dec 21, 2019 · ^ arr[pointer] = arr[3] = 70 The two pointer approach involves the use of multiple pointers. Intuitions, example walk through, and complexity analysis. Apr 17, 2023 · In this post, we will explore the two pointers technique, focusing on the differences and advantages of using ‘and’ and ‘or’ conditions within while loops. It's a technique typically used in searching pairs in a sorted array. It does not matter what you leave beyond the returned k (hence they are underscores). We mentioned two scenarios to use the two-pointer technique: Two pointers starts at different position: one starts at the beginning while another starts at the end; Two pointers are moved at different speed: one is faster while another one might be slower. This complete guide provides step-by-step explanations, multiple solution approaches, and optimized code in python3, java, cpp, c. In one scenario, one pointer starts from the beginning and the other pointer starts from the end, moving toward one another until they Sep 7, 2025 · 🚀 Must-Solve Two Pointers Questions on LeetCode Two Pointers is one of the most versatile and powerful techniques in algorithm design, especially when working with arrays and strings. Usually, the problems related to strings and arrays can be solved by brute force, which basically means your code searches all the possible solutions and returns the correct ones. Two Pointer is a classic technique used to solve coding interview problems. This approach typically achieves O (n) time complexity. A structured collection of Data Structures, Algorithms, and SQL solutions solved on LeetCode using Java. Day 2-5 : Two Pointers Two Pointers mean firstly checking two elements - the first and the last elements in the array, and then check the first and the last elements in the array that have not been checked, so on and so force. Use this 2-minute decision checklist and a cheat sheet of the 12 core algorithm patterns (with signals, templates, and common traps). com/in/navdeep-singh-3aaa14161/🥷 Discord: https: Jan 21, 2023 · One of these approaches goes by Two-Pointers and is the subject of this video. Organized topic-wise with clean code, time & space complexity for interview preparation. So, we ought to use a two-pointer approach here. The name does justice in this case, it involves using two pointers to save time and space. The text serves as an in-depth tutorial for mastering two-pointer techniques on LeetCode, emphasizing the importance of recognizing problems where this approach is applicable. LeetCode Easy but an important concept for interviews! ⚡ Time Complexity: O (n) ⚡ Space Complexity: O (1) Drop a 🔥 if you’ve solved this one! 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 LeetCode Explore is the best place for everyone to start practicing and learning on LeetCode. Dec 9, 2025 · The ultimate comprehensive guide to two pointers. g. Master Data Structures & Algorithms for FREE at https://AlgoMap. . That’s it. Used the two-pointer technique to reduce the time complexity from O (n³) to O (n²). Apr 28, 2025 · In this post, I’ll share three approaches to solve the classic Two Sum problem efficiently with proper Time Complexity, Space Complexity… Master the powerful Two Pointer Technique 🔥 — one of the most efficient strategies for solving problems on arrays, strings, and more. 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 In-depth solution and explanation for LeetCode 26. youtube. The solutions are written in JavaScript and aim to provide a comprehensive understanding of different algorithms and approaches to solving these challenges. 6 days ago · Stop guessing. Return the intersection of these two interval lists. Lately, I’ve been grinding on LeetCode, specifically on two-pointer questions 🚀. Explore 16 DSA problem-solving patterns with links to LeetCode and Medium. 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. io/ - A better way to prepare for Coding Interviews🧑‍💼 LinkedIn: https://www. Understanding the subtle differences between these two approaches can be the key to solving LeetCode problems more efficiently. Master Two Pointers & Sliding Window Techniques Solve 25+ handpicked LeetCode problems using two of the most powerful patterns in DSA. Time & space complexity: Nov 11, 2024 · 6- Many two-pointer problems ask for optimized time complexity, so if a brute-force solution feels too slow (O (n²)), two pointers might be a good fit for an O (n) approach. 06K subscribers Subscribed We would like to show you a description here but the site won’t allow us. In this video, we expla This video explains a basic and tricky 2 pointer technique for reversing a string. There are two common scenarios in which the two-pointer approach is used. Dsa Practice Sheet – Two Pointers (With Approach Hints) - Free download as PDF File (. In this post, you will be going through 13 problems which kind of sets the tone for the other Apr 4, 2024 · The two-pointer technique is a widely used approach to solving problems efficiently, particularly scenarios involving arrays or linked lists. Start one pointer at the beginning and one at the end. fast/slow, front/back, etc. Oct 1, 2024 · Optimizing Code Efficiency with Two Pointers and Sliding Window Techniques in C#: LeetCode Problems and Solutions In the world of algorithm design, efficiency is paramount. io/nikoo28Join this channel to get access to perks: https://www. io/Code solutions in Python, Java, C++ and JS for this can be found at my GitHub repo here: h 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 each type of two pointer (ie. As we delve into the challenges in this section, you’ll discover how to leverage this technique to navigate through arrays and efficiently address a variety of problems. , detecting cycles in a linked list, finding the middle element): One pointer (slow) moves one step at a time. We can sequentially add the next biggest elements with the two pointer approach. So, I’m putting together this list of 20 questions that I believe are The Two Pointers technique is a versatile approach known for its effectiveness in optimizing time and space complexity. This video explains a basic and tricky 2 pointer technique for reversing a string. For the purpose of this article, a pointer is an index of an array. Dec 21, 2021 · There are more than 130/1300 problems in Leetcode that can be solved using two pointer approach. If you are preparing for Tired of seeing duplicate elements in your array? Let’s fix that! 🔥 Using the two-pointer approach, we can efficiently remove duplicates in-place while maintaining the order. LeetCode Problems solved in this video: Thanks for Watching! If you found this video helpful, check other Geekific Example 1: Input: nums = [1,1,2] Output: 2, nums = [1,2,_] Explanation: Your function should return k = 2, with the first two elements of nums being 1 and 2 respectively. Aman's AI Journal | Course notes and learning material for Artificial Intelligence and Deep Learning Stanford classes. When the sum of the two elements is > target we reduce the end index by one. Jan 21, 2023 · One of these approaches goes by Two-Pointers and is the subject of this video. txt) or read online for free.

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