Two Pointers Vs Sliding Window. Calculate the result of the first window, as we calculate in the naiv
Calculate the result of the first window, as we calculate in the naive approach. 4. The main idea behind the sliding window technique is to have a left and a right pointer and to slide those in the correct direction when appropriate. Discover how these algorithms can enhance your coding skills, offering a powerful approach to solving complex problems with ease and simplicity. ” This window can slide or expand/shrink based on certain conditions. In this video we will try to solve a very famous and interesting Problem "Reverse Vowels of a Str This technique shows how a nested for loop in some problems can be converted to a single for loop to reduce the time complexity. net/group/fehu-cpccontests : https://codeforces. Couldn't really find any study material/details on it. 1 day ago 路 When They Appear Most Often Sliding window problems (moving left and right pointers) Subarray slicing and substring extraction Binary search (mid-point calculations and boundary updates) Two-pointer techniques (especially when pointers should meet or cross) Understanding the debugging process is crucial for solving array problems efficiently. In this case I create a variable for the first pointer called p1 and my second pointer p2 is the index of each iteration through the input string. Problem: Minimum size subarray sum Two Pointers vs Sliding Window Sliding window problems are similar to the same directions problems, only instead, the function performs on the entire interval between the two pointers. This guide covers four essential patterns with execution traces and real implementations. ” In problems that require determining the maximum or minimum Two Pointers and Sliding Window Techniques Introduction Two-pointers is one of the most common problem-solving techniques that is used in many popular algorithms. Comprehensive study plan with weekly LeetCode problems covering Two Pointers, Sliding Window, Binary Search, and more. Versatility: They can be applied to a wide range of problems in arrays, strings, and other data structures. good luck! c. The two-pointer technique is a simple but powerful way to work with arrays, linked lists, or strings. Dec 13, 2022 路 If you’ve ever been tasked with solving a complex problem involving arrays, you’ve likely heard of the Sliding Window approach and the Two Pointers approach. Dec 19, 2025 路 Two pointers optimize traversal by focusing on element relationships (pairs, cycles, reversals), while sliding window optimizes subarray/substring problems by maintaining a contiguous window with specific properties. POST 3: Common Mistakes & Learnings 馃摌 DSA Learning Update | Sliding Window Insights While solving Sliding Window problems, I noticed a few common mistakes: • Expanding the window without In this video, I talk about the sliding window algorithm and explain it using leetcode examples. Let's make DSA easy and fun — Logic Over Syntax! 馃摎 Stay tuned for more videos on Sliding Window, Linked Lists, and full DSA roadmap in Telugu! Subscribe to Logic Over Syntax for the complete Nov 2, 2025 路 Use Two Pointers when you need to maintain a dynamic window that expands or shrinks based on specific conditions. Nov 7, 2019 路 Double hung windows & sliding windows are among the most popular replacement options. Jul 14, 2022 路 Motivated by my successful solution to the “Longest Substring Without Repeating Characters” problem on Leetcode, I eagerly present the “Sliding Window” technique, a simple yet intriguing method that leverages two pointers to achieve optimal performance. This technique is particularly useful for solving substring problems, finding subarrays with specific properties, or calculating running averages. Basic Steps to Solve Sliding Window Problems: Find the size of the window on which the algorithm has to be performed. Two pointer problems, how do we know whether to fixate the left pointer and extend right pointer vs fixate the right pointer and increment the left pointer A question that came up in my mind while I was working on 713. See what they can do to transform your home. Two Pointers Sorted data, in-place processing, stream-like behavior. The 2-Pointer approach is used to search over a list (or multiple list) in such a way that the time complexity can be minimised. 馃敼 Real-World Applications of Sliding Window: Finding the maximum sum of a subarray of fixed length. 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. Recursion & Backtracking – Think N-Queens 2. Mar 18, 2025 路 Both the two-pointer and sliding window techniques are powerful methods for solving problems involving arrays and strings. Jul 2, 2023 路 The Two Pointers, Sliding Window, and Prefix Sum techniques are powerful tools for solving algorithmic problems related to arrays and strings. Sliding Window (Fixed & Variable) Continuous ranges, rate limits, rolling metrics. Nov 28, 2025 路 Confused between Sliding Window and Two Pointers? Learn the exact decision framework to pick the right pattern for array and string problems instantly. Apr 16, 2025 路 Most of these can be solved using two powerful techniques: Two Pointers and Sliding Window. It utilizes two pointers to create a dynamic window that can expand and contract based on specific conditions. Sliding windows are defined by left, and right boundary; thus, the techniques are sometimes called two pointers. 馃敼 3. Sep 15, 2025 路 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 The sliding window technique is acknowledged for its simplicity and effectiveness in handling subarray problems, with the flexibility to adapt to fixed or variable-sized windows. The main idea behind two pointers technique is that we maintain two variables denoting two different indices in the array and those two variables are moved based on some condition. Sep 1, 2025 路 There window has two points and a fixed size, and it slides until the end point arrives. Seem these topics are being asked in the interview very frequently so understanding them clearly is required. Thin frames are a hallmark of modern windows and doors. Oct 25, 2025 路 Two pointers and sliding window are optimization techniques for array and string problems. pat Aug 29, 2025 路 Master two-pointer and sliding window techniques for Python coding interviews. org/plus?source=youtubeFind DSA, LLD, OOPs, Core Subjects, 1000+ Premium Questions company wise, Aptitude, SQL, AI doubt Nov 4, 2025 路 A complete guide to two-pointer and sliding window techniques with examples, logic, and Python implementations. So the main idea behind the sliding window technique is to convert two nested loops into a single loop. 1. A sliding window uses two pointers; the difference in my head is that the window includes all elements in between those two pointers to some effect. Consider the following problem: Feb 12, 2024 路 Section 1: What Is Sliding Window? The sliding window is basically the extension of the two pointer approach where we use the two pointer (left and right) to create a window. Let’s break them down and see how they can save you from brute force nightmares 馃槄 馃攣 What is the Two Pointers Technique? This technique involves using two indices (pointers) to iterate through a data structure. Two Pointer aur Sliding Window — dono powerful techniques hain, lekin beginners aksar confuse ho jaate hain 馃くIs video me simple examples ke saath samjhenge 馃搶 DSA Practice – Two Pointers & Sliding Window Focus Today, I solved a set of problems that strengthened my understanding of two-pointer techniques, sliding window patterns, and frequency Core Algorithm Patterns Reusable mental models for: Sliding window Two pointers Binary search on answers DFS vs BFS Greedy decisions Prefix sums Dynamic programming states Patterns > memorization. Seem these topics are being asked in sheets : https://vjudge. Two-Pointer Sliding Window Algorithm One of the most common approaches to solve many algoritm problems is to apply some type of 2-Pointer approach. Aug 5, 2022 路 The "sliding window" algorithm is a derivative of the general two pointer strategy. g. Find max/min length of subarray that satisfies certain conditions. a dynamic (variable-size) window. Master Data Structures & Algorithms for FREE at https://AlgoMap. this is the key to understanding how sliding window works. The two pointer method is a helpful technique to always keep in mind when working with strings and arrays questions. We would like to show you a description here but the site won’t allow us. 9K 239K views 1 year ago Two Pointer and Sliding Window Playlist | Language Independent Course This is the 1st Video on our Two Pointer Technique playlist. What is the algorithm about? 957K subscribers Subscribed 5. 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. Oct 5, 2024 路 Concepts Sliding windows arise from the need to optimize time complexity to O(n). 971K subscribers Subscribed 16K 722K views 1 year ago Two Pointer and Sliding Window Playlist | Language Independent Course Jan 28, 2024 路 The Sliding Window technique extends the two-pointer approach by employing a pair of pointers to establish a dynamic “window. , 2-Sum, Container with Most Water). Jan 7, 2023 路 However, the Sliding window technique can reduce the time complexity to O (n). Introduction to Two Heaps Pattern Find the Median of a Number Stream (medium) Solution: Find the Median of a Number Stream Sliding Window Median (hard) Solution: Sliding Window Median Maximize Capital (hard) Solution: Maximize Capital Jul 23, 2025 路 Sliding window problems are computational problems in which a fixed/variable-size window is moved through a data structure, typically an array or string, to efficiently process or analyze the continuous subsets of elements. Sep 9, 2025 路 Opposite Direction: Pointers at start and end, moving toward each other (e. While solving a geometry problem, I came across an approach called Sliding Window Algorithm. It uses two indices that either start at different positions and move toward each other, or move in the same direction, to efficiently compare, scan, or rearrange elements. The author emphasizes the importance of considering the starting point, speed of pointers, and stop conditions when designing two-pointer algorithms. , Remove Duplicates from Sorted Array). It's especially useful for: Sorted Jan 26, 2025 路 In this video, I talk about the two pointers technique which is a very important DSA topic for coding interviews. Common questions to sliding windows usually involves questions about subarray. Ideal for coding interviews and skill development. When is this technique useful? Competitive Programming level 2 - Lecture 4 - Two Pointers & Sliding Window TechniquesWe discussed :- Two Pointers- Sliding windowExamples :Two Sum :https:// Sliding Window Technique\Two Pointer Approach\ Leetcode problem\DSA PreparationHey guys, In this video, We're going to learn the concept of Sliding Window Te Apr 11, 2023 路 The sliding window technique involves two pointers: one that points to the beginning of the window and another that points to the end of the window. Sliding Windows and Two Pointers | Sliding Window efficiently finds the maximum or minimum sum of k consecutive elements by maintaining a dynamic subarray, reducing complexity to O (n). Also note that these approaches in general don't guarantee O (N) time because treatment for every step might take some time. 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 Traversal Tree Question Pattern L1. Would be grateful for your ideas May 15, 2024 路 A more flexible variation of the sliding window technique, the two pointers used in this technique can move independently or in tandem through data structures. It outlines when to use each technique, including patterns for fixed and variable size windows, and various scenarios for two pointers, such as opposite ends and same direction. It would have 2 pointers, one representing the start of the window and one representing the end. Dec 9, 2025 路 Stop confusing two pointers with sliding window. Master the Two Pointers and Sliding Window techniques with Abhinav Awasthi in this detailed tutorial! Whether you're preparing for coding interviews, competi Trying to get better at problem solving and it seems inefficient to grind leetcode without understanding what lies behind the problems. Oct 12, 2022 路 The flexible-sized window is a bit more complicated because we need two logics, the first is when to update the size of the window, and the second is when to update the pointer to a new Dec 29, 2021 路 I am trying to figure out what is the main difference between the Sliding Window and Two-pointer technique. The document provides a cheat sheet for Sliding Window and Two Pointers techniques used in algorithm problems. Common Patterns – Sliding Window, Two Pointers, Fast/Slow 4. 1 day ago 路 A two-pointer window is correct and simpler to implement. Jul 2, 2023 路 Conclusion The Two Pointers, Sliding Window, and Prefix Sum techniques are powerful tools for solving algorithmic problems related to arrays and strings. This approach is best demonstrated through a walkthrough, as done below. Same Direction: Both pointers move forward, where one lags behind the other to form a range (e. For example, sliding window problems might involve contiguous values: Oct 1, 2024 路 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. I’ll be direct here: if negatives are possible and n is non-trivial, the prefix-sum map is the right choice. Master coding interviews with AlgoMonster: learn prefix sum, two pointers, and sliding window techniques. Learn efficient O (n) algorithms, common patterns, and optimization strategies to ace your next technical interview. 3 days ago 路 Learn the foundational algorithms every software engineer needs. Sliding window usually has predefined size ("window size K"), while distance between two pointers changes during traversal. You will also find notes, and code for your specific language. com/group/UDjERbGBXK/contestsIntro - 0:00:00Two Pointers - 0:00:34Sliding Window - 1: Sep 30, 2024 路 The sliding window is an efficient algorithmic approach used to solve problems involving contiguous sequences, such as strings and arrays. I would say that that two pointer is a type of sliding window, where you are moving the left and right end points, whereas in sliding window, you have a fixed sub array that you use to traverse through an array. Each section includes typical code patterns to illustrate the implementation of these techniques. The difference with "sliding window" is that we are looking at not just the two values at each index but a subset -- or, a "window" -- of the array on each iteration through the array. We start by initializing both pointers to the first element in the collection. View the slide with "Slide Mode". When to Use the Two-Pointer Approach? The decision to use the two-pointer approach depends on the nature of the problem and the specific requirements of the task at hand. We break down Binary Search, Sliding Window, Dynamic Programming, and more in this guide. The two pointer approach and sliding window technique are closely related. Jul 23, 2025 路 The concept of using two pointers to manipulate an array is relatively easy to understand and implement, making it accessible to programmers of varying skill levels. This is done by using hashing to quickly look up the presence of an element in the window, and using two pointers to track the start and end of the window. Example: Find the smallest subarray with a sum ≥ K, or move all zeroes to the Nov 24, 2024 路 The sliding window technique frequently works hand-in-hand with the two-pointer algorithm (especially in problems involving dynamic window sizes), as they share a common principle: optimizing Master the Two Pointers and Sliding Window techniques with Abhinav Awasthi in this detailed tutorial! Whether you're preparing for coding interviews, competi Jul 23, 2025 路 Sliding window problems are computational problems in which a fixed/variable-size window is moved through a data structure, typically an array or string, to efficiently process or analyze the continuous subsets of elements. Jun 10, 2024 路 In the realm of algorithm design and data analysis, three fundamental techniques — Constant Window, Sliding Window, and Two Pointers — play crucial roles in solving a variety of problems. Each time you increase the left pointer, you're knocking out all the substring/subarrays that are rooted at that left pointer (it's impossible to consider them again - and for good reason: the condition would not be satisfied by *any* subset rooted at that left pointer). Maintain a pointer on the start position. Dec 22, 2024 路 The sliding window is a method that involves maintaining a subset of data by using two pointers to define the “window. Patreon Link: https://www. SLIDING WINDOW AND TWO POINTERS by Angira Ghosh • Playlist • 24 videos • 54,158 views. Two Pointers uses two indices to traverse and solve problems on sorted arrays in O (n) time, ideal for finding pairs or subarrays meeting specific conditions. Dynamic Programming – Memoization vs Tabulation 3. By leveraging these techniques, developers can improve the efficiency and effectiveness of their solutions. If you are not Mar 22, 2021 路 To create a sliding window we need two pointers. Learn how these methods streamline data processing, offering a powerful approach to enhance your programming skills and boost performance. The idea: maintain a sliding window [L, R] of values within K of the current value. Mar 4, 2025 路 Uncover the ultimate guide to 'sliding window vs two pointers' and unlock efficient coding techniques. The focus is to Sliding window / Two pointers When working with arrays, the sliding window is a popular technique for efficiently solving problems with just two-pointers. Reduce the time complexity of problems from O(n^2) to O(n) by using the sliding window approach. Nov 24, 2024 路 The sliding window technique frequently works hand-in-hand with the two-pointer algorithm (especially in problems involving dynamic window sizes), as they share a common principle: optimizing Apr 27, 2024 路 Importance of Two Pointers and Sliding Window Approach: Efficiency: These techniques often lead to optimized solutions with lower time and space complexity compared to brute-force or naive approaches. 9K 239K views 1 year ago Two Pointer and Sliding Window Playlist | Language Independent Course To get you started, here are some pointers on creating two distinct looks with a patio door: If you're trying to match a modern home, consider a sliding door with a thin frame, like the 200 Series Narroline® or the E-Series with contemporary panels. Sliding window optimization is a technique that combines hashing and two pointers to improve the performance of the sliding window algorithm. 2 days ago 路 Binary search per element is clean, but you can do even better with a two-pointer window, which is O (n log n) for sorting + O (n) for scanning. Check out TUF+:https://takeuforward. io/Code solutions in Python, Java, C++ and JS for this can be found at my GitHub repo here: h Oct 25, 2025 路 Two pointers and sliding window are optimization techniques for array and string problems. Introduction to Sliding Window and 2 Pointers | Templates | Patterns take U forward 453K views 1 year ago 19:40 Learn the Sliding Window technique and how to use it. When to use a fixed-size window vs. When to use while loop for sliding window or two pointer instead of if statment? After practicing leetcode for a little bit now, everytime I come across a question that's a sliding window two pointer, my mind goes to if statement for when a condition needs to be met. These two approaches used to solve Jul 14, 2022 路 Motivated by my successful solution to the “Longest Substring Without Repeating Characters” problem on Leetcode, I eagerly present the “Sliding Window” technique, a simple yet intriguing method that leverages two pointers to achieve optimal performance. These techniques are widely used to optimize solutions for array and string problems, typically reducing the time complexity from O (n²) to O (n). May 20, 2025 路 Discover the ultimate guide to efficient algorithms! Uncover the secrets of 'sliding window' and 'two pointers' techniques, perfect for optimizing your code. Sep 10, 2023 路 Two-Pointer Approach: In some cases, you can think of the sliding window as a two-pointer approach, where two pointers (usually the left and right) roam through your data while maintaining a 957K subscribers Subscribed 5. Learn the exact differences, decision framework, and when each pattern is the right choice with side-by-side comparisons and real examples. Dec 29, 2021 路 Hi guys, I am trying to figure out what is the main difference between the Sliding Window and Two-pointer technique. Apr 18, 2025 路 This document provides a detailed explanation of two essential algorithmic techniques: sliding window and two pointers. 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. Each In this playlist, you will learn about 2 pointers and Sliding Window in depth. We would want a more optimal solution! This is where the idea of a sliding window would come in. 馃敼 2. The window would represent the current section of the string that you are looking at (which substring you're examining). Apr 20, 2021 路 In simple terms, the sliding window algorithm focuses on managing a window size (subarray or substring) in a larger data structure for efficient computations, while the two pointers algorithm relies on using two points, usually indexes to traverse and compare elements in a sequence in a data structure eg arrays or strings. Sliding window / Two pointers When working with arrays, the sliding window is a popular technique for efficiently solving problems with just two-pointers. While they share similarities, they are used in different contexts and Dec 11, 2025 路 Confused between Sliding Window and Two Pointers? Learn the exact decision framework to pick the right pattern for array and string problems instan Tagged with slidingwindow, twopointers, patternrecognition, interviewstrategy.