Two Pointer Questions. Apr 1, 2022 · Two pointer approach is an essential part of a prog

Apr 1, 2022 · Two pointer approach is an essential part of a programmer’s toolkit, especially in technical interviews. Level up your coding skills and quickly land a job. Two pointers is a technique where we use two index variables to traverse a data structure, typically an array or string. Two-Pointer Technique After finishing the previous chapter, we are now familiar with the concept of array and string and are able to perform basic operations in an array or a string. I’ve been really obsessed with it. Master 41 two pointers problems frequently asked in technical interviews. You just have to assess all the given options and click on the correct answer. The pointers typically move at different speeds or in different directions, allowing for efficient traversal and comparison. To discuss any doubts or questions after today's class with the community, join Scaler Club (Join DS and Algorithm Discussions channel): https://chat. Sep 18, 2023 · The two pointer technique is a must-know strategy for technical interview candidates. 22 hours ago · From Middle English two, twa, from Old English twā, feminine and neuter of twēġen (whence twain), from Proto-West Germanic *twai-, from Proto-Germanic *twai, from Proto-Indo-European *dwóh₁. problems based on two pointers approach. 5 months, and wanted to share my findings/classifications here. Feb 12, 2025 · Quiz on Two Pointer Technique for DSA Quiz will help you to test and validate your DSA knowledge. something representing, represented by, or consisting of two units, such as a playing card with two symbols on it Jul 15, 2024 · Two (noun): symbol or word representing the number after one and before three in the decimal system. Master the Two Pointers technique used in algorithmic problem-solving. Two Sum II - Input Array Is Sorted Medium Key: If you are given a sorted array, consider moving from both ends toward the center. Lately, I’ve been grinding on LeetCode, specifically on two-pointer questions 🚀. Comparing the letters at two indices can yield two outcomes. 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. The Two-Pointer Technique efficiently solves the "Two Sum Sorted" problem in a sorted array. These questions test your understanding of two pointers concepts and are essential for coding interview success. How to use two in a sentence. 2. b. Codeforces. May 31, 2023 · Given a sorted array A with N elements, not all distinct, count the pairs of integers (i, j) such that A[i] + A[j] is equal to K . (LC 167) Two Sum II - Input Array Is Sorted 167. This simplicity makes the technique easy to implement. Jan 13, 2022 · I have been solving all two pointers tagged problems in last 3. This approach helps in optimizing runtime to a great extent. The two pointers technique is a technique used to iterate through a data set, typically an array or a list, in a controlled way. If you are preparing for technical interview, two pointers is one of the popular topics that you can't skip :). One such pattern is the “Two … Sharpen your coding skills related to two pointers and ace your coding interviews. Idioms put two and two together, to reach the correct and obvious conclusion: Putting two and two together, they came up with the murderer. Apr 4, 2024 · The two-pointer technique is a widely used approach to solving problems efficiently, particularly scenarios involving arrays or linked… Level up your coding skills and quickly land a job. It relies on two reference variables that travel through… Want to nail your next technical interview? Here's a list of the top 6 Two Pointers interview questions and answers for 2025. This approach optimizes the runtime by utilizing some order (not necessarily sorting) of the data. The word two is derived from the Old English words twā (feminine), tū (neuter), and twēġen (masculine, which survives today in the form twain). Mar 30, 2022 · Two Pointers algorithm is one of the most commonly asked questions in any Coding/Technical Interview. Jul 11, 2023 · How Two Pointers work, when to use them in interviews, and common mistakes to avoid. Apr 27, 2024 · The Two Pointers Technique The Two Pointers technique involves using two pointers that either move towards each other or in the same direction to iterate through the data, typically a list or array. For the purpose of this article, a pointer is an index of an array. The two-pointer technique will Two Pointer Technique The 2 pointer technique is mostly applicable in sorted arrays where we try to perform a search in O (N). A data aggregate (or just aggregate) is a group of primitives that are logically contiguous in memory and that are viewed collectively as one datum (for Jul 23, 2025 · Two pointers is really an easy and effective technique which is typically used for searching pairs in a sorted array. Learn how it simplifies array and string problems with real-world examples and tips for coding interviews in 2025. I have Engineering Computer Science Computer Science questions and answers When the mouse pointer is placed between two column letters and turns into two arrows pointing in opposite directions, which of the following is true?Question 13Answera. The pointers move towards each other, away from each other, or in the same direction based on the problem's requirements. 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). In this article, we'll go over the fundamental concepts and provide various examples, so you know when and how to apply the two-pointer strategy. Dec 21, 2019 · Remember earlier we said two pointers were useful to look at 2 different indices of the input to make a decision. Watch replays of Two Pointer interviews. 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. You can find a list here… Problems on 2 Pointers are a test of your observation skills and how well you can deduce patterns. Master Data Structures & Algorithms for FREE at https://AlgoMap. This approach works in constant space. com/signup_user_c Level up your coding skills and quickly land a job. I have solved more than 500+ questions on LeetCode and have current ratings of 1572 . The name does justice in this case, it involves using two pointers to save time and space. We would like to show you a description here but the site won’t allow us. Classifications Same Directions These questions have two pointers that move in the same direction. Join over 28 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Conclusion The Two Pointers technique is a must-have weapon in a competitive programmer's arsenal. Idioms in two, into two separate parts, as halves: The cake was cut in two. Nov 21, 2022 · In this class, Manvi mam will cover a bit of advanced implementation of arrays i. Sep 4, 2025 · The Two Pointer Technique is an algorithmic strategy where two indices (pointers) are used to traverse a data structure (usually arrays or strings) from different positions. The column can be hidden. So, I’m putting together this list of 20 questions that I believe are Master the two-pointer method with interactive visuals and real-time coding exercises to solve array problems efficiently. In this guide, we'll cover the basics so that you know when and Test your coding skills and improve your problem-solving abilities with our comprehensive collection of Two Pointers problems. An entire column can be highlighted. . For string problems (like "at most K changes"), two pointers + frequency counters are your friends. The pointers i & j cannot be same. scaler. put two and two together, to reach the correct and obvious conclusion. A data aggregate (or just aggregate) is a group of primitives that are logically contiguous in memory and that are viewed collectively as one datum (for The two pointer approach and sliding window technique are closely related. Here is an example of a same direction two pointer question: Remove Duplicates. fast/slow, front/back, etc. Mar 17, 2025 · The two-pointer algorithm only requires initializing two pointers and moving them accordingly based on the problem constraints. Iterating two monotonic pointers across an array to search for a pair of indices satisfying some condition in linear time. The term "two" is widely recognized and used across various contexts, from simple arithmetic to cultural idioms. Two pointer approach is exactly what it sounds like. in terms of an array, vector, linked list, etc we can use this approach. Thanks to Stepavly and Supermagzzz for their help with lecture notes and testing In computer science, a pointer is a kind of reference. Two is a noun when it refers to the number two as in two plus two is four. e. 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. This is the best place to expand your knowledge and get prepared for your next interview. Traverse the first linked list using the pointer p until you reach the end. Given two arrays ( and ) sorted in ascending order and an integer , we need to find and , such that is equal to . If you are preparing for Technique utilizing two pointers to efficiently solve problems or traverse data structures. Aug 11, 2020 · Two-pointer technique is commonly used to solve array problems very efficiently. Jan 13, 2022 · Hello, I have been solving all two pointers tagged problems in last 3. The data in the column can be moved. Jan 21, 2023 · One of these approaches goes by Two-Pointers and is the subject of this video. Jul 23, 2025 · 5. It can be used with linked lists and other structures as well. May 24, 2019 · Two-pointer is a quite common method used to solve Leetcode problems related to strings, arrays and linked lists. Perfect for students, developers, and anyone looking to enhance their coding knowledge and technical abilities. It covers a variety of questions, from basic to advanced. As the name suggests, the two-pointer approach can be used to help process two elements per loop, instead of just one. This technique is particularly useful for solving substring problems, finding subarrays with specific properties, or calculating running averages. Sep 3, 2020 · Let's learn about the Two Pointers technique to algorithm templates and two main variations of this technique. Can you solve this real interview question? Squares of a Sorted Array - Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order. Essentially, it involves using two pointers (or indices) to traverse an array, often with each moving at a different speed or starting position. Welcome to our ultimate guide on mastering the Two Pointers technique with the top 21 LeetCode problems! This session is perfect for anyone preparing for co Sep 29, 2022 · I have been solving all two pointers tagged problems in last 3. in two, into two separate parts, as halves. Sep 15, 2025 · 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, Trapping Rain Water and many other popular interview questions. There are two common scenarios in which the two-pointer approach is used. There are a lot of ways to classify two pointer problems. A column can be moved. Jan 29, 2024 · Two Pointer 🚀| Summary with practice questions Sheet (C++) on LeetCode Hi, my name is Mahesh. c. In this blog, we’ll break it down step by step with examples, Java code, and interview patterns. In this technique pointers represent either index By following the outlined tips and strategies, readers can enhance their problem-solving skills and efficiently tackle algorithmic questions that benefit from the two-pointer method. It involves using two pointers, one pointing to the beginning of the data set and the other pointing to the end, and moving them towards each other based on specific conditions. Common patterns in the two-pointer approach entail: Two pointers, each starting from the beginning and the end until they both meet. Jul 19, 2024 · Mastering Coding Interview Patterns: Two Pointers (Java, Python and JavaScript) Introduction In the world of coding interviews, certain patterns appear frequently. Below are some classifications, although they are in no way exhaustive. When the given data is present in a linear form i. 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. One pointer moving at a slow pace, while the other pointer moves at twice the speed. This is why the two-pointer technique is efficient. Here's an example. Jun 25, 2024 · There are many Leetcode problems you can solve with two pointer technique and its variations. Sliding window is a variation of the two pointer method where one pointer represents the start of the window and the other represents the end. I found some lists such as These Tips from Sean Prashad however I still find myself having to guess most of the time. Whenever an array question deals with finding two numbers in an array that satisfy a certain condition, either Two Pointers Questions Part 1 138. 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. LeetCode Problems solved in this video: Thanks for Watching! If you found this video helpful, check other Geekific 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. It allows solving a class of problems efficiently by using two pointers to iterate through arrays or linked The two pointer technique is a near necessity in any software developer's toolkit, especially when it comes to technical interviews. The width of the column can be 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. We are able to process two elements per loop instead of just one. A data primitive (or just primitive) is any datum that can be read from or written to computer memory using one memory access (for instance, both a byte and a word are primitives). In this Video, we are going to learn a very important concept i. If you found one fuzzy mitten and then your friend gave you another one, you would have two mittens — perfect for your two hands. Solution 1 [10] O (n) 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. With enough practice, you will start recognizing patterns where this technique applies immediately, saving both time and complexity. 1. In this playlist, we will solve and understand popular problems on Two Pointers Technique asked by Top Companies like - Amazon, - Meta, - Google, - Microsoft 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 New lesson is about two pointers method. In one scenario, one pointer starts from the beginning and the other pointer starts from the end, moving toward one another until they Aug 6, 2024 · As a result, a lot of interviews tend to be a little biased to questions using this technique. Let’s go over the Two Pointers pattern, its real-world applications, and some problems we can solve with it. The quiz contains 13 questions. d. Prepare for DSA interview rounds at the top companies. We use two pointers to get a certain task done. The two-pointer technique can be applied to any iterable data structure, not just arrays. 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 / … Oct 21, 2019 · In Coding Patterns series, we will try to recognize common patterns underlying behind each algorithm question, using real examples from Leetcode. In this exclsuive video, we at Scaler, help you solve some Jul 23, 2025 · The two-pointer approach involves using two pointers (indices or references) to traverse an array or sequence. Dec 23, 2025 · Mastering the Two Pointer Pattern: 14 Most Asked Interview Questions with Optimal Solutions How to identify a Two Pointer problem You can usually apply the two pointer approach when the data is … Apr 17, 2021 · Two are better than one if they act as one. Two pointers is a popular technique in the interview problems. 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. This approach is generally used to search pairs in a sorted array. Idioms of two minds (about something) someone's two cents two sides of the same coin (Definition of two from the Cambridge Academic Content Dictionary © Cambridge University Press) Two is a whole number that's greater than one, but less than three. As the name suggests, in this technique you have two pointers that are usually just variables pointing to the indices of the array. 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. Two definition: The cardinal number equal to the sum of 1 + 1. io/Code solutions in Python, Java, C++ and JS for this can be found at my GitHub repo here: h 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. Solve the most popular two pointers interview questions. Let us start looking at this with the help of a question. Two pointer algorithm is one of the most commonly asked questions in any programming interview. Jul 23, 2025 · Two pointers is really an easy and effective technique which is typically used for searching pairs 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. From basic algorithms to advanced programming concepts, our problems cover a wide range of languages and difficulty levels. Any ideas? More about EDU section you can read in this post. ). 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. Programming competitions and contests, programming community Nov 17, 2023 · So, two pointer ( or N pointer for that matter ) is usually a really clever optimization on some bruteforce approches in certain condition. Double Pointers and Solving a lot of MCQs There is a lot to learn, Keep in mind “ Mnn boot karega k chor yrr apne se nahi yoga Nov 7, 2025 · The Two Pointer technique is a pattern built on simple movement and precise logic. The meaning of TWO is being one more than one in number. Go to EDU → What topics you want to learn next? I would prefer topics not covered in my Youtube course, something more specific for competetive programming. This is the two pointer solution: Nov 17, 2023 · Practice and master all interview questions related to Two Pointers Nov 17, 2023 · Practice and master all interview questions related to Two Pointers In computer science, a pointer is a kind of reference. It involves initializing two pointers, comparing their sum to the target, and adjusting the pointers 2 days ago · Move Zeros is asked in almost every coding interview Tomorrow’s video shows the optimized two pointer solution Subscribe to CodeWithJalandhar for placements Can you solve this real interview question? Squares of a Sorted Array - Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order. When to Use Two Pointers: Jul 23, 2025 · The Two Pointer Approach is a powerful and efficient technique used to solve problems involving sorted arrays, searching, and optimization.

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