Two Pointer Pattern Leetcode. Remove Duplicates from Sorted Array in Python, Java, C++ and more.

Remove Duplicates from Sorted Array in Python, Java, C++ and more. c. 6. Aman's AI Journal | Course notes and learning material for Artificial Intelligence and Deep Learning Stanford classes. Contribute to muradxq/leetcode-patterns development by creating an account on GitHub. If you are preparing for 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. Follow up to the Two Pointer Approach. I’ve been really obsessed with it. The term "two" is widely recognized and used across various contexts, from simple arithmetic to cultural idioms. 10. ” It teaches you reusable patterns like sliding window, two pointers, merge intervals, and fast/slow pointers — the same patterns used to solve 70% of LeetCode problems. Two is a noun when it refers to the number two as in two plus two is four. 7. This is because two pointers can easily track the start and end of the window. I have In this video, we break down: The exact definition of two pointers 🔁 Three pointer movements – toward, away, and fast-slow 🧩 Examples: Palindrome check, target sum, and middle node 🚀 Let's briefly review this technique. Cyclic sort pattern. Free NeetCode 150 67 / 150 completed Arrays & Hashing Two Pointers Sliding Window +14 more 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. Sep 12, 2024 · These patterns—such as Two Pointers, Sliding Window, Binary Search, Divide and Conquer, and others—are widely applicable to a variety of coding problems. In-place reversal of linked list pattern. I’ll go through an overview, walk … 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. The set of elements could be a pair, a triplet or even a subarray. Instead of checking Pattern Recognition (Most Important) Most problems are not new — they are variations of known patterns: Sliding Window Two Pointers Binary Search on Answer DP States Greedy Choices Graph 2 days ago · Fast and Slow Pointers is a powerful pattern where you use two pointers and move them at different speeds. So, I’m putting together this list of 20 questions that I believe are 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. Fast & slow pointers pattern. something representing, represented by, or consisting of two units, such as a playing card with two symbols on it 21 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. 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. Why it works: Moving the "less promising" pointer cannot miss a better solution. The #1 hack for Grokking the Coding Interview. Greedy strategy: Use two pointers (often start and end) and greedily move the pointer that improves the solution. (Here, pointers are basically array indexes). If you found one fuzzy mitten and then your friend gave you another one, you would have two mittens — perfect for your two hands. Whether you’re aiming for interview success, coding mastery, or just want to understand how top engineers think, this is your go-to LeetCode roadmap. If you are preparing for The provided content is a comprehensive guide detailing strategies and tips for solving two-pointer problems on LeetCode, including understanding indicators for such problems, employing various techniques, and solving classic examples. By using two pointers instead of nested loops, we can often reduce the time complexity from O (n²) to O (n). Intuitions, example walk through, and complexity analysis. Understanding these patterns helps in breaking down complex challenges into simpler steps, enabling the efficient development of solutions. put two and two together, to reach the correct and obvious conclusion. 3 days ago · While many algorithm books focus on the “what,” this one focuses on the “how. Welcome to the first post in my series, Leetcode is Easy! Introduction Today we’ll be learning about the Two Pointer approach. Dec 21, 2019 · Leetcode is Easy! The Two Pointer Pattern. Two Pointers is often useful when searching pairs in a sorted array or linked list; for example, when you have to compare each element of an array to its other elements. 8. Ace your Software Engineering interviews. Jan 13, 2022 · Hello, I have been solving all two pointers tagged problems in last 3. Introduction Today we’ll be learning about the Sliding Window pattern. Idioms put two and two together, to reach the correct and obvious conclusion: Putting two and two together, they came up with the murderer. Jul 15, 2024 · Two (noun): symbol or word representing the number after one and before three in the decimal system. 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). Use this 2-minute decision checklist and a cheat sheet of the 12 core algorithm patterns (with signals, templates, and common traps). Ideal for college-level CS students. Jan 26, 2025 · Two Pointers in 7 minutes | LeetCode Pattern AlgoMasterIO 9. Modified binary search pattern. We would like to show you a description here but the site won’t allow us. 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 two, into two separate parts, as halves. Jul 23, 2025 · The Two Pointer Approach is a powerful and efficient technique used to solve problems involving sorted arrays, searching, and optimization. Master 28 coding patterns; unlock thousands of LeetCode problems. Sliding window optimization is a technique that combines hashing and two pointers to improve the performance of the sliding window algorithm. length. A better way to prepare for coding interviews. Problems solved using Two Pointers & related Learning in Action: LeetCode #11 – Container With Most Water Today, I deep-dived into the Two Pointer Technique using the problem Container With Most Water (LeetCode #11). Tree breadth first search pattern. The Fast & Slow pointer approach, also known as the Hare & Tortoise algorithm, is a pointer algorithm that uses two pointers which move through the array (or sequence/ LinkedList) at different speeds. Two pointer pattern. Use this as a checklist or a guide to mastering this pattern. org/developedbyed/Leetcode challengeshttps: These resources teach you the core LeetCode patterns, how to break down problems logically, and prepare for FAANG-level interviews with structure — not chaos. 06K subscribers Subscribed Jan 13, 2022 · Hello, I have been solving all two pointers tagged problems in last 3. Tagged with slidingwindow, leetcode, algorithms, interviewprep. 5. Master DSA patterns: https://algomaster. io My DSA Playlist: https://www. Perfect for FAANG prep, placements. Problems using this pattern: 🚀 Week 1 of my DSA Journey This week I focused on mastering the Two Pointer technique by solving core array problems on LeetCode & GeeksforGeeks. Bitwise xor pattern. Explore 16 DSA problem-solving patterns with links to LeetCode and Medium. 🚀 Patterns 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 Level up your coding skills and quickly land a job. 2 days ago · Problem type: Problems involving sorted arrays where you need to find pairs or optimize based on positions. It can help you solve multiple linked lists and array related problems like: Two is a noun when it refers to the number two as in two plus two is four. Master DSA, Coding Interview Patterns and System Design. 9. Two definition: The cardinal number equal to the sum of 1 + 1. About Master Two Pointers & Sliding Window Techniques Solve 25+ handpicked LeetCode problems using two of the most powerful patterns in DSA. The biggest takeaway today — simplify the logic by narrowing down the search space instead of brute forcing! Pattern-Based Practice Solve problems from Array-Logic-Patterns and Tcs-Styled-Leetcode-Patterns to recognize recurring logic. The meaning of TWO is being one more than one in number. Two heap pattern. b. This is the best place to expand your knowledge and get prepared for your next interview. Two is a noun when it refers to the number two as in two plus two is four. You can find a list here… I've watched neetcodes solution and I'm still having a hard time understanding. Merger interval pattern. Two pointers is often useful when searching pairs in a sorted array or linked list, like when you have to compare each element of an array to its other elements. Subsets pattern. Two pointers is another common technique for tracking the elements in a sliding window. takeuforward is the best place to learn data structures, algorithms, most asked coding interview questions, real interview experiences free of cost. Seem these topics are being asked in the interview very frequently so understanding them clearly is required. Could someone please explain the two poitner solution to the container problem and also give me similar two pointer questions for practice? Thank you. May 4, 2025 · Download LeetCode PDFs on DSA topics, 75-day challenges, patterns, and top 100 interview questions. 13. All three Solved Subsets and Subsets II on LeetCode , but the real win was understanding the pattern, not the code. 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). 🚀 Day 23 of my DSA Journey (LeetCode + Java) Today’s practice was all about Sliding Window — one of the most powerful and efficient patterns for subarray and substring problems. Must-do List for Interview Prep In-depth solution and explanation for LeetCode 26. Top ‘K These resources teach you the core LeetCode patterns, how to break down problems logically, and prepare for FAANG-level interviews with structure — not chaos. Use this pattern when dealing with sorted arrays or lists where you need to find pairs that satisfy a specific condition. 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. Learn the two pointers pattern with step-by-step examples, code templates, and LeetCode practice problems. 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 Jan 13, 2022 · Hello, I have been solving all two pointers tagged problems in last 3. youtube. 6 days ago · Stop guessing. this is the key to understanding how sliding window works. Optimize & Reflect Compare your approach with provided solutions and refine time & space complexity. fast/slow, front/back, etc. Learn all variants, when to use each pattern, complete templates in multiple languages, and a systematic approach to solve any two pointers problem. ). 🧠 Learned how to solve “Remove Nth Node from End of List” and “3Sum” efficiently using the two-pointer pattern. Includes detailed explanations, problem links, and clear strategy breakdowns for both fixed-size and variable-size window problems. This complete guide provides step-by-step explanations, multiple solution approaches, and optimized code in python3, java, cpp, c. 1. The Two Pointers pattern is a technique that uses two pointers to iterate through a data structure (usually an array or linked list) in a single pass. Apr 1, 2022 · Concept Introduction Two pointer approach is an essential part of a programmer’s toolkit, especially in technical interviews. A curated collection of LeetCode solutions in Java, featuring clean code, optimal algorithms, and helpful comments. More importantly, I am having a hard time generalizing the concept of two pointers to anything but summation questions. Attempt Previous Year Questions Work through all PYQs without looking at solutions initially. Sep 7, 2025 · Here’s a list of important Two Pointers problems on LeetCode, curated with their strategies and direct links. Jun 25, 2024 · There are many Leetcode problems you can solve with two pointer technique and its variations. 🎯 Overview This repository contains 100 LeetCode problems organized into 17 topic-based categories, covering all major DSA patterns. 3. 5 months, and wanted to share my findings/classifications here. Ideal for interviews and competitive programming! Join Brilliant using the link bellow for 30-day free trial + 20% off the premium subscription https://brilliant. Two Pointers or Iterators Two Pointers is a pattern where two pointers iterate through the data structure in tandem until one or both of the pointers hit a certain condition. The word two is derived from the Old English words twā (feminine), tū (neuter), and twēġen (masculine, which survives today in the form twain). Perfect for DSA revision, technical interviews, and leveling up your problem-solv Level up your coding skills and quickly land a job. 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) Idioms in two, into two separate parts, as halves: The cake was cut in two. Dec 9, 2025 · The ultimate comprehensive guide to two pointers. Better than official and forum solutions. . 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. 12. What is the Two pointer method ? Two pointer Dec 21, 2019 · Leetcode is Easy! The Sliding Window Pattern. For example, take a look at the following problem: Level up your coding skills and quickly land a job. Depth first search DFS pattern. May 29, 2019 · 2. Two is a whole number that's greater than one, but less than three. Skip the grind with hands-on prep developed by MAANG engineers. I have solved more than 500+ questions on LeetCode and have current ratings of 1572 . After solving 500+ problems, I've broken down the Two Pointers Pattern into 5 categories that will make you spot these problems instantly in interviews. 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. Key insight: • Backtracking = DFS on choices • Maintain one working list • Add → 21 hours ago · Struggling with 'Longest Substring'? The Sliding Window pattern is easy if you follow this step-by-step 'Expand-Contract' framework. 11. good luck! The Fast & Slow pointer approach, also known as the Hare & Tortoise algorithm, is a pointer algorithm that uses two pointers which move through the array (or sequence/ LinkedList) at different speeds. Perfect for coding interview preparation. If you are preparing for 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. Return the indices of the two numbers, index1 Jan 29, 2024 · Two Pointer 🚀| Summary with practice questions Sheet (C++) on LeetCode Hi, my name is Mahesh. Jan 7, 2024 · In the competitive landscape of technical interviews, particularly on platforms like LeetCode, the journey from novice problem-solver to proficient coder requires more than a random assortment of Oct 31, 2022 · Explanation (Before diving into an explanation of Fast & Slow Pointers, it might be helpful to have an understanding of the Two Pointers pattern as well as linked list data structures. com/playlist?list=PLK63NuByH5o9odyBT7nfYkHZyvGQ5oVp2 My System Design Cou Level up your coding skills and quickly land a job. I found some lists such as These Tips from Sean Prashad however I still find myself having to guess most of the time. Nov 11, 2024 · Understanding Two Pointers in Python: Guide with LeetCode Tips & Tricks Two-pointers can definitely be tricky sometimes! I just want you to know that it’s completely normal to feel confused Jun 27, 2022 · The two-pointers pattern includes two pointers which iterate through the data structure in tandem until one or both of the pointers hit a certain condition. Dec 29, 2021 · I am trying to figure out what is the main difference between the Sliding Window and Two-pointer technique. Lately, I’ve been grinding on LeetCode, specifically on two-pointer questions 🚀. ) May 9, 2025 · Solve Leetcode — Two Pointer Pattern In this blog, let’s dive deep into two pointer method and understand how it works with simple examples. 21 hours ago · I'm Still Grinding LeetCode and These 8 Advanced Patterns Changed Everything 🚀 # leetcode # algorithms # datastructures # interview LeetCode Mastery for Students (2 Part Series) 1 I Struggled with LeetCode for Months Until I Learned These 6 Patterns 🎯 2 I'm Still Grinding LeetCode and These 8 Advanced Patterns Changed Everything 🚀 Sep 24, 2024 · Two Pointers in 7 minutes | LeetCode Pattern AlgoMasterIO 196K views • 11 months ago 25:49 Two-Letter Card Game is LeetCode problem 3664, a Medium level challenge. I’ll go through an … 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 Pattern 2: Two Pointers In problems where we deal with sorted arrays (or LinkedList s) and need to find a set of elements that fulfill certain constraints, the two pointers approach becomes quite useful. Let these two numbers be numbers[index1] and numbers[index2] where 1 <= index1 < index2 <= numbers. 4. Learn algorithms, data structures, and coding interview strategies. How to use two in a sentence. 2. The name does justice in this case, it involves using two pointers to save time and space. Each solution includes: Complete Java implementation Time and space complexity analysis Detailed approach explanation Test methods with example cases Clean, well-documented code A curated list of leetcode questions grouped by their common patterns Nov 15, 2025 · Two Pointers is the most underrated pattern that appears in 100+ LeetCode problems, yet most people don't know when to use it.

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