Two Pointer Javascript. 00:00 Intro1:00 Example 1:56 Two Pointers Approach6:20 Stack

00:00 Intro1:00 Example 1:56 Two Pointers Approach6:20 Stack Approach#leetcode #javascri May 15, 2022 · Multiple Pointers Using JavaScript Problem Solving Patterns Hey wassup guys, so today I learned ( re-learned ) the Multiple Pointers pattern and wanted to solidify how this pattern works by walking … May 6, 2025 · If your code still leans on O (n²) loops to scan arrays, the Two-Pointer technique is one of the Tagged with javascript, tutorial, algorithms, beginners. In JavaScript … Two Pointer is a classic technique used to solve coding interview problems. Jan 25, 2024 · In conclusion, pointers in JavaScript are like arrows pointing to specific locations in memory. Mar 31, 2023 · This is a guide to Pointers in JavaScript. e, int ***t_ptr. Whether you're a beginner or an experience Reverse Only Letters LeetCode 917 | Two Pointers | JavaScript Santamaria Code 750 subscribers Subscribed Mar 17, 2025 · What are Pointers? In JavaScript, pointers serve as signposts, directing the user to other variables or objects located in memory. With "touchstart" you have "touches" property, but with PointerEvents I don't know any way to know if multi-touch occurred (besides checking if there's more than 1 target, which obviously not possible when you have big elements on screen. In this article we have discussed a JavaScript program for two pointers technique, where we first discussed the brute force approach to solve the problem and then used two pointers approach to solve the problem. Mar 17, 2025 · The two-pointer technique uses two-pointers or variables to iterate through a data structure, typically an array or linked list. May 17, 2021 · With the two pointer method, we can place two pointers (exactly what the name says) at the beginning (left pointer) and ending (right pointer) indices of an array. The two pointer technique is a near necessity in any software developer's toolkit, especially when it comes to technical interviews. Nov 2, 2022 · 121. Apr 3, 2024 · Master Data Structures & Algorithms for FREE at https://AlgoMap. 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). Let’s get started. let's say leftP=0, rightP=0; and then by using for loop, the rightP will increase up to the end of array until there's no more elements and then leftP move by 1 Let’s go over the Two Pointers pattern, its real-world applications, and some problems we can solve with it. Mastering Leetcode Problem-Solving Using Simple JavaScript. e. Jan 3, 2022 · What is a pointer? In a for loop, the "i" value is the pointer i. ### How Two Pointers Work In this 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. Jun 11, 2025 · Pointer events extend DOM input events to support various pointing input devices such as pen/stylus and touch screens as well as mouse. Lastly, it also supports visualizing standalone JavaScript execution, but not web frontend code that does DOM manipulation on webpages. Take your coding skills to the next level with our latest video tutorial on two pointers algorithms in JavaScript. In the examples below, two pointers are used to accomplish a variety of tasks. The key idea is that the pointers start at different positions and move in a coordinated way to traverse the data structure efficiently. The lesson includes a step-by-step construction of the solution, from initial array sorting to pointer manipulation, and concludes with Using Two Pointers Technique We have used two pointers technique to find the pairs in array with given sum. Common examples: 3 days ago · Learn about JavaScript events, their types, and how to use them to create interactive web applications on GeeksforGeeks. May 6, 2025 · If your code still leans on O (n²) loops to scan arrays, the Two-Pointer technique is one of the simplest ways to unlock linear-time speed-ups—without fancy data structures or extra memory. Mar 17, 2025 · What are Pointers? In JavaScript, pointers serve as signposts, directing the user to other variables or objects located in memory. Another variation to this problem is when the first pointer begins at the beginning while the second pointer begins at the end. The pointer is a hardware-agnostic device that can target a specific set of screen coordinates. Is it even possible? Nov 8, 2021 · The two-pointer technique allows you to iterate through an array and find the two numbers that sum up to the target in the most efficient… Search "two pointers leetcode" @GregHogg Two Sum II - Leetcode 167 - 2 Pointers (Python) Two Sum II - Two Pointers Algorithm - Leetcode 167 6. This technique is especially useful for problems involving searching, sorting, and manipulating data. Here we discuss the introduction, references in JavaScript and examples respectively. Aug 22, 2022 · 0 As covered in comment, answers and documentation, strings are immutable in JavaScript. Jun 27, 2022 · Samantha Diaz Posted on Jun 27, 2022 Algorithms - Two Pointers Pattern This covers the Two Pointer Pattern algorithm for technical interviews in JavaScript. I have explained two approaches to solving the problem with examples. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket © 2025 Google LLC Sep 26, 2020 · The two-pointer strategy appears to be a good starting point for optimization. Oct 25, 2025 · Multilevel Pointers in C Double Pointers are not the only multilevel pointers supported by the C language. If you haven't applied two-pointer techniques in your problem-solving process, I hope this example boosts your confidence in coming up with more performant algorithm solutions. Walk through of one of the most useful techniques, the two pointer, definitely worth knowing for coding interviews at companies like Microsoft, Amazon, Apple Explore the Two Pointers technique with practical code examples in Python, Java, C++, and JavaScript. The approach in this video will help you solve a wide range of LeetCode style interview problems. 4K subscribers Subscribed Aug 13, 2022 · The Two Pointers Technique is a technique that allows you to optimize your runtime (time complexity Tagged with algorithms, binarysearch, twopointers, searching. Array String Linked List Hash Table Stack & Heap Binary Tree Matrix Two Pointers Binary Search Sorting Backtracking Dynamic Programming Greedy Dec 12, 2023 · 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. But we if have 2 pointers we can make different calculations based on the different pointers. If the problem requires finding pairs, a specific subsequence, or checking for a palindrome, consider using the two pointer technique. One such pattern is the “Two … Mar 1, 2013 · Understand two pointers technique | Palindrome example On this channel, you'll find: Beginner to Advanced DSA Tutorials (Arrays, Linked Lists, Trees, Graphs Hey Guys, In this video I have explained two pointers technique which is helpful in Competitive Programming and coding interviews. Onward and upward! For instance, it can precisely visualize critical concepts such as pointers, uninitialized memory, out-of-bounds errors, nested arrays/structs/unions, type punning, and bit manipulation. May 17, 2023 · I want to solve the "palindrome" problem by using the 'two pointers' pattern. ### Introduction to Two Pointers The two-pointer technique is a simple yet powerful method used to solve many algorithmic problems. For this approach, we utilise two pointers - one representing the buy day and the other the sell day, and also keep track of the maximum profit. Master this essential concept with step-by-step examples and practice exercises. Jul 23, 2025 · The Two Pointer Approach is a powerful and efficient technique used to solve problems involving sorted arrays, searching, and optimization. Onward and upward! Mar 31, 2023 · This is a guide to Pointers in JavaScript. This method is highly efficient when traversing arrays Jun 11, 2025 · If two pointers are down, and the distance between the pointers is increasing (signifying a pinch out or zoom in), the element's background color is changed to pink, and if the distance between the pointers is decreasing (a pinch in or zoom out), the background color is changed to lightblue. It is also much faster than using two for loops as both pointers can move through the array at the same time (don't quote me on this part though). toLowerC Jan 21, 2022 · In this video we continue our deep dive into the two pointer approach to optimize looping through an array or linked lists by applying it to a medium difficu 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. 1K Dislike 91 If you use pointer events to program a drag and drop interaction with JavaScript, information about the dragged element is transferred and stored in thedataTransferobject, whereas if you use the Drag and Drop API, the element is physically moved across the page. Jul 23, 2025 · Given singly linked list with every node having an additional "arbitrary" pointer that currently points to NULL. Jul 9, 2021 · JavaScript Walk through of one of the most useful techniques, the two pointer, definitely worth knowing for coding interviews at companies like Microsoft, Amazon, Apple Nov 27, 2022 · This post explores the two pointers technique in JavaScript, a powerful approach to solving problems related to arrays and strings. Dec 12, 2023 · 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. This post explains the two pointers technique in JavaScript, an efficient method used to solve problems involving sequences, such as array. Jul 23, 2025 · Now let’s see how the two-pointer technique works. Unsupported Features Search "two pointers leetcode" @GregHogg Two Sum II - Leetcode 167 - 2 Pointers (Python) Two Sum II - Two Pointers Algorithm - Leetcode 167 6. This is our final solution. The two-pointer technique involves placing two pointers at opposite ends of an array and comparing their values to reverse its order by swapping or shifting items. Aug 11, 2020 · Two-pointer technique is commonly used to solve array problems very efficiently. Sep 3, 2021 · Mastering Multiple Pointers (in Javascript) A wildly helpful algorithm pattern When Colt Steele first walked us through Multiple Pointers as one of the common patterns for algorithm solutions, I … Feb 7, 2022 · In this video, we close out our two-pointer introduction series by applying this pattern to a difficult challenge in order to optimize how we loop over an ar Sep 26, 2020 · The two-pointer strategy appears to be a good starting point for optimization. Need to make the "arbitrary" pointer point to the next higher-value node. Having a single event model for pointers can simplify creating websites, applications and provide a good user experience regardless of the user's hardware. Detailed solution for 3 Sum : Find triplets that add up to a zero - Problem Statement: Given an array of N integers, your task is to find unique triplets that add up to give a sum of zero. Implementing a List Node in JavaScript The types are “number” (for a JavaScript number corresponding to a C integer, float, or general pointer), “string” (for a JavaScript string that corresponds to a C char* that represents a string) or “array” (for a JavaScript array or typed array that corresponds to a C array; for typed arrays, it must be a Uint8Array or Int8Array). To use the two pointer technique we use pointers to keep track of indices of an array, string or Jul 19, 2024 · Mastering Coding Interview Patterns: Two Pointers (Java, Python and JavaScript) Introduction In the world of coding interviews, certain patterns appear frequently. It involves using two pointers to traverse a data structure, like an array or a linked list, to achieve a specific goal. ### How Two Pointers Work In this We can use Two Pointers to efficiently traverse through a sorted array and find a pair of numbers that add up to a given sum. Master Data Structures & Algorithms for FREE at https://AlgoMap. Learn how to efficiently solve problems like finding pairs, reversing strings, and merging sorted arrays. io/Code solutions in Python, Java, C++ and JS for this can be found at my GitHub repo here: h Nov 8, 2021 · The two-pointer technique allows you to iterate through an array and find the two numbers that sum up to the target in the most efficient… Apr 29, 2025 · Reversing a string using the two pointers pattern is an efficient and widely used approach with a time complexity of O(n). Apr 4, 2024 · The two-pointer technique is a widely used approach to solving problems efficiently, particularly scenarios involving arrays or linked lists. In this lesson, we explore the two-pointer technique for solving array problems efficiently in JavaScript. io/Code solutions in Python, Java, C++ and JS for this can be found at my GitHub repo here: h Jun 11, 2025 · If two pointers are down, and the distance between the pointers is increasing (signifying a pinch out or zoom in), the element's background color is changed to pink, and if the distance between the pointers is decreasing (a pinch in or zoom out), the background color is changed to lightblue. Aug 6, 2024 · The two types of pointers in two pointer approach are slow and fast pointers. We have explained how to use it in JavaScript. The ability to apparently assign a property value to a primitive string value results from early JavaScript engine design that temporarily created a String object from primitive strings when calling a String. it goes through each item in the array. By sorting the array and using two pointers, we identify pairs of integers that sum up to a target value with optimal time and space complexity. Jan 26, 2025 · In this video, I talk about the two pointers technique which is a very important DSA topic for coding interviews. The two pointer technique is one of the tools to solve competitive programming and to solve technical interviews. Aug 2, 2025 · 3 Ways to Remove Duplicates from a JavaScript Array — Splice, Set, and Two-Pointer Explained Understand why removing duplicates is important and where it’s commonly used. . Two Pointers Technique (in JavaScript). Select one: True False Which statement about JavaScript mouse events is correct? a. When to Use the Two Pointer Pattern The Two Pointer Pattern is helpful when you need to perform a search to find a pair of numbers that meet a certain condition within a sorted data set. Feb 7, 2022 · In this video, we close out our two-pointer introduction series by applying this pattern to a difficult challenge in order to optimize how we loop over an ar Dec 19, 2021 · It seems like subset array but i would like to get this output with two pointer way. What if we want to change the value of a double pointer? In this case, we can use a triple pointer, which will be a pointer to a pointer to a pointer i. prototype method on the primitive. Circular Linked Lists: Circular linked lists are a variation of a linked list in which the last node points to the first node or any other node before it, thereby forming a loop. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Best Time to Buy and Sell Stock | JavaScript | Two Pointers | LeetCode 75 | Daily Challenge LeetCodeWithMonu 2. They enable efficient manipulation and sharing of data, making them an essential concept for any developer to grasp, especially when working on data structures. GitHub Gist: instantly share code, notes, and snippets. Learn "Two Pointers Technique in JavaScript" with our free interactive tutorial. We will start with a brute force solution Also we are going to use two pointers, buy day and sell day, achieving linear time complexity, O(n). Whenever an array question deals with finding two numbers in an array that satisfy a certain condition, either Feb 23, 2021 · The two pointer technique is very useful to understand for solving array problems efficiently. Here is the code that solves this problem: var isPalindrome = function(s) { const newStr = s. Algorithms Playlist:https:/ Jun 20, 2025 · The Two Pointers pattern involves using two variables (usually called left and right, or i and j) that traverse a data structure at different speeds or from different directions. We maintain two pointers (such as left and right in this example) at different positions and moving them according to requirement. Jun 13, 2025 · The two pointers — one iterating over the original array elements, and the other indicating the new positions after duplication — allowed an efficient, in-place solution. 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. Oct 19, 2020 · We have explained two pointer technique which is the optimal way to solve problems related to arrays in O(N) time. 2 I have big HTML element on the screen (canvas) and I want to detect multi-touch events. Feb 5, 2020 · In this article, we will learn about two pointer technique. While reversing… Sep 27, 2023 · Mastering the Two-Pointer Algorithm: A Guide When it comes to solving complex problems involving arrays, linked lists, or even strings, the Two-Pointer Algorithm emerges as a powerful technique. In short, you need to return an array of all the unique triplets [arr[a May 15, 2024 · Each pointer refers to an index and travels through the array/string/linked list in order to solve a problem. 1K Dislike 91 Oct 19, 2020 · We have explained two pointer technique which is the optimal way to solve problems related to arrays in O(N) time. Let’s take a look at the example, [7, 3, 6, 1, 2, 3], with the chart below. Table of contents Given problem Solution of Two pointers technique When to use Wrapping up Given problem Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new Jun 2, 2020 · Doubly Linked Lists: Each node contains two pointers, a pointer to the next node and a pointer to the previous node. We will start with a brute force solution May 17, 2021 · With the two pointer method, we can place two pointers (exactly what the name says) at the beginning (left pointer) and ending (right pointer) indices of an array. To visualize the solution and step through the below code, click Visualize the Solution on the right-side menu or the VISUALIZE button in Interactive Mode. Let’s go over the Two Pointers pattern, its real-world applications, and some problems we can solve with it. The two pointers is an efficient technique to solve problems of sorted arrays. In this guide, we'll cover the basics so that you know when and Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

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