Two Pointer Problems Hackerrank. Function Description Complete the function with the following

Function Description Complete the function with the following parameter (s): : a reference to the head of the list Print Level up your coding skills and quickly land a job. Contribute to alexanderscott/HackerRank development by creating an account on GitHub. Problems on 2 Pointers are a test of your observation skills and how well you can deduce patterns. find all the required pair Solving code challenges on HackerRank is one of the best ways to prepare for programming interviews. If you are preparing for technical interview, two pointers is one of the popular topics that you can't skip :). Nov 7, 2025 · The Two Pointer technique is a pattern built on simple movement and precise logic. This is where the Two Pointers technique shines — it allows you to solve many of these problems in O (n) or O (n log n) time. If you are preparing for Hi guys this repository contains solutions for all hackerrank coding questions(Problem Solving,C, Python) - Ratheshprabakar/Hackerrank-Solutions Sep 7, 2025 · Here’s a list of important Two Pointers problems on LeetCode, curated with their strategies and direct links. Classifications Same Directions These questions have two pointers that move in the same direction. Nov 2, 2025 · What Is the Two Pointer Technique? The Two Pointer approach uses two indices (pointers) to traverse data structures like arrays or strings, usually from opposite ends or at different speeds. Check the sum of the elements at these two pointers: If the sum equals the target, we’ve found the pair. 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. The merge point is where both lists point to the same node, i. - Ash2127/Hackerrank-C-Language-Solutions Jan 13, 2025 · The two-pointer technique is a fundamental and versatile problem-solving strategy that is particularly useful in solving array and string-related problems. The problem emphasizes understanding array manipulation and optimizing search operations through hashing. they reference the same memory location. We would like to show you a description here but the site won’t allow us. Below are some classifications, although they are in no way exhaustive. If the problem requires it, how should relationships between three or more pointers be managed? Compare the data in two linked lists node by node to see if the lists contain identical data. the basic functionalities of pointers Level up your coding skills and quickly land a job. g. Aug 6, 2024 · Learn how to reduce the three-pointers problem to multiple two-pointer problems in this problem. This video can serve as a C tutorial to learn how to pass v Join over 28 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Master 41+ two pointers problems asked in technical interviews at Google, Amazon, Microsoft, Meta, Apple. The name does justice in this case, it involves using two pointers to save time and space. Welcome to CodersDaily! In this video, we'll delve into the "Pointers in C" challenge on HackerRank. Aug 28, 2024 · LeetCode: A treasure trove of coding problems, LeetCode has a dedicated section for two-pointer problems. Join over 11 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. In this exclsuive video, we at Scaler, help you solve some Sep 4, 2025 · Instead of relying on brute force approaches that may take O (n²) time, the two pointer approach strategically uses two indices (pointers) to traverse the data structure and solve problems in O (n) or O (n log n) time. Hello coders, in this post you will find each and every solution of HackerRank Problems in C language. Jul 8, 2025 · The two-pointer technique is an essential tool for any programmer’s algorithmic toolkit. You can find a list here… Hi, guys in this video share with you the HackerRank Pointers in C problem solution | HackerRank C Problems solutions | Programmingoneonone. 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 Jul 23, 2025 · The Two Pointer Approach is a powerful and efficient technique used to solve problems involving sorted arrays, searching, and optimization. e. The approach in this video will help you solve a wide range of LeetCode style int Join over 28 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Perfect for students, developers, and anyone looking to enhance their coding knowledge and technical abilities. If the sum is less than the target, move the left pointer to the right to increase the sum. The guide is organized into two main sections: first, how to recognize a two-pointers problem, and second, a ranked discussion of the techniques and approaches—from the most frequently used patterns to those that occur less often. Below is a detailed study guide that analyzes the Two Pointers problems from the collection. Join over 28 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Solutions Wait! Have you challenged yourself with this problem? If yes, click here to show the solution. Solving code challenges on HackerRank is one of the best ways to prepare for programming interviews. Start with easier problems and gradually work your way up to more challenging ones. Jan 7, 2024 · In essence, the Two Pointer technique aims to address problems where identifying pairs, subarrays, or specific patterns within arrays or linked lists is crucial. Solutions to various HackerRank. . HackerRank Hello world in c solution HackerRank Playing with characters solution in c HackerRank sum and difference of two numbers solution in c HackerRank functions in c solution HackerRank pointers in c solution HackerRank Conditional statements in c solution HackerRank For loop in c solution HackerRank Sum of Digits of a five-digit number Join over 28 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. 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 the exploration of Two Pointers challenges commence! Happy coding! Given the pointer to the head node of a linked list, change the next pointers of the nodes so that their order is reversed. 5 months, and wanted to share my findings/classifications here. In order to access the memory address of a variable, , prepend it with sign. The head pointer given may be null meaning that the initial list is empty. But what exactly is the Two-Pointer Technique? It is a method where two pointers traverse through an array or list, often moving towards each other, to solve a specific problem. By using two pointers to traverse data structures (typically arrays or strings), we can Cycle Detection See the original problem on HackerRank. Learn how it simplifies array and string problems with real-world examples and tips for coding interviews in 2025. We traverse the list using two pointers that we’ll refer to as fast and slow. Both the next and random pointer of the new nodes should point to new nodes in the copied list such that the pointers in the original list and copied list represent the same list state. The two-pointer technique is a search algorithm used to solve problems involving collections such as arrays and lists by comparing elements pointed by two pointers and updating them accordingly. 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. I like how this explanation keeps pointers simple, and I recently tested a similar idea and it worked well for me when learning C++. Whether you're a beginner or looking to refine your C pr Jul 23, 2025 · Conclusion The two-pointer approach is a valuable tool in the programmer, offering a versatile and efficient technique for solving array-related problems. In this post, you will be going through 13 problems which kind of sets the tone for the other 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 array Sep 18, 2023 · The two pointer technique is a must-know strategy for technical interview candidates. Reference Solutions for Competitive Programming on Codeforces, SPOJ, UVA, CodeChef, Hackerrank, Hackerearth,… - hiepxuan2008/competitive-programming Jan 26, 2025 · In this video, I talk about the two pointers technique which is a very important DSA topic for coding interviews. HackerRank personal solutions. Apr 1, 2022 · Concept Introduction Two pointer approach is an essential part of a programmer’s toolkit, especially in technical interviews. This repository contains the solutions for the CCC Hackerrank coding problems. Below is a list of the challenges covere 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. They are used whenever a function needs to modify the content of a variable, but it does not have ownership. - Common problem patterns: Sliding-window (e. com problems. For these questions, each pointer represents where the next element belonging to that region should go. That is, change the next and prev pointers of the nodes so that the direction of the list is reversed. Sep 5, 2025 · Master the Two Pointer Technique to solve array and string problems efficiently. For example, &val returns the memory address of . It allows solving a class of problems efficiently by using two pointers to iterate through arrays or linked Nov 21, 2022 · In this class, Manvi mam will cover a bit of advanced implementation of arrays i. It relies on two reference variables that travel through… Learn how to declare pointers and use them. By understanding the Two-Pointer Technique, you can code more efficiently, thereby reducing the time and space complexity of your algorithms. This method is highly efficient when traversing arrays Prepare to sharpen your problem-solving skills, enhance your algorithmic thinking, and master the art of using Two Pointers to tackle a diverse array of challenges. **What is the Two Pointers Technique? Well Coderz, Today we will be solving Pointers in C HackerRank Solution. if you have any Jul 14, 2025 · Master the Two Pointers technique with practical Python and JavaScript examples designed to help you ace technical interviews. problems based on two pointers approach. (Here, pointers are basically array indexes). A good takeaway is to practice with small examples and tools like memreduct from memoryreduct to stay aware of how memory is being used as you experiment. Given pointers to the heads of two sorted linked lists, merge them into a single, sorted linked list. Below is a list of practice problems from Leetcode that can be solved using the two-pointer approach. Contribute to RexIncogn/HackerRank-Solutions development by creating an account on GitHub. Given pointers to the head nodes of linked lists that merge together at some point, find the node where the two lists merge. It is my solution to the problems on the hackerrank. Solutions of HackerRank C Language Problem Statements. - ShreyaK2710/CCC-Hackerrank-Day-3 There are a lot of ways to classify two pointer problems. Directly copy paste these codes in the HackerRank terminal and you are good to go. Jul 31, 2021 · Learn how to declare pointers and use themA pointer in C is a way to share a memory HackerRank C- Pointers in C. Jul 7, 2022 · One would resolve the two sum problem by using two pointers or a hash table algorithm If the input array is sorted or the output does not require returning array indices, one would use both two-pointers and hash table algorithm If the input array is not sorted and the output Jun 25, 2024 · There are many Leetcode problems you can solve with two pointer technique and its variations. You can acquaint yourself with how this approach is used. Aug 28, 2025 · Your challenge: find exactly two items whose prices add up to your budget. Either head pointer may be null meaning that the corresponding list is empty. This repository contains my solutions to various C programming challenges on HackerRank. Dec 21, 2021 · There are more than 130/1300 problems in Leetcode that can be solved using two pointer approach. Objective In this challenge, you will learn to implement the basic functionalities of pointers in C. An efficient solution is based on the “two pointers idiom”. The task is to print the of each node, one per line. In this blog, we’ll break it down step by step with examples, Java code, and interview patterns. Jul 12, 2024 · HackerRank Pointers in C problem solution – In this tutorial, we will solve the HackerRank Pointer in C problem and write a program solution for this problem. A pointer in C++ is used to share a memory address among different contexts (primarily functions). Longest Substring Without Repeating Characters 4 , Minimum Window Substring), two-pointers (Container With Most Water), prefix-sum (Subarray Sum Equals K), all 25 solutions for c in HackerRank. Two Pointer Technique Made Easy | Important Two Pointer Problems Solved Step by Step 2023 Data Structures Explained for Beginners - How I Wish I was Taught Jul 26, 2025 · 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 array. Given 2 arrays, you have to maitain them, given 4 types of queries. By understanding these patterns and when to apply them, you can solve a wide range of problems with Level up your coding skills and quickly land a job. This is the two pointer solution: The two-pointer technique can also be used to solve problems that involve partition arrays into different regions. com site. Given the pointer to the head node of a doubly linked list, reverse the order of the nodes in place. From basic algorithms to advanced programming concepts, our problems cover a wide range of languages and difficulty levels. Whether it is searching, manipulation, optimization, or comparison, the two-pointer approach excels in various problem-solving scenarios. LeetCode Problems solved in this video: Thanks for Watching! If you found this video helpful, check other Geekific Apr 6, 2024 · The problem statement of Hackerrank Pointers question for C++ is to update two Pointers value, one with the sum and other with the difference using a function named update. Two Pointer is a classic technique used to solve coding interview problems. Practice 15 easy, 24 medium, and 2 hard two pointers coding challenges. A pointer in C is a way to share a memory address among different contexts (primarily functions). Contribute to rene-d/hackerrank development by creating an account on GitHub. Jan 21, 2023 · One of these approaches goes by Two-Pointers and is the subject of this video. Apr 4, 2024 · The two-pointer technique is a widely used approach to solving problems efficiently, particularly scenarios involving arrays or linked lists. HackerRank: Similar to LeetCode, HackerRank offers a variety of challenges that can help you hone your two-pointer skills. You are given a pointer to the node of a linked list. Here's a detailed YouTube description for a video titled "HackerRank Pointers in C Solution":---**HackerRank Pointers in C Solution | Full Walkthrough and Ex 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 Jan 13, 2022 · Hello, I have been solving all two pointers tagged problems in last 3. Use this as a checklist or a guide to mastering this pattern. This simple-sounding problem — known in the coding world as the Two Sum problem — isn’t just a brain teaser. Level up your coding skills and quickly land a job. 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 Aug 28, 2024 · LeetCode: A treasure trove of coding problems, LeetCode has a dedicated section for two-pointer problems. Each solution addresses a specific problem and is implemented in C. There are around 140 problems today, but I only solved the public ones (117 problems). Jan 13, 2025 · The two-pointer technique is a fundamental and versatile problem-solving strategy that is particularly useful in solving array and string-related problems. If the head pointer is , indicating the list is empty, nothing should be printed. Learn step-by-step with examples, visual diagrams, and Python code. Jul 23, 2025 · The 2-Sum problem is a popular algorithmic challenge where the goal is to identify two distinct elements in an array whose sum equals a specific target. Complete Coding Interview Roadmap – What You MUST Know in 2026 👨‍💻💼 1️⃣ Programming Language Mastery Choose one (C++, Java, Python) and master: Syntax & built-in functions Time Join over 28 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. This is the best place to expand your knowledge and get prepared for your next interview. Jul 8, 2025 · The two-pointer technique is one of the most elegant and efficient algorithmic patterns in computer science. Here is an example of a same direction two pointer question: Remove Duplicates. The two pointer technique is a near necessity in any software developer's toolkit, especially when it comes to technical interviews. note this is not my coding style it is just for the fast writing in problem-solving contests - mohandsakr/my-problem-solving-solutions 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. For example Master the Two Pointers technique used in algorithmic problem-solving. They are primarily used whenever a function needs to modify the content of a variable that it does not own. HackerRank solution for Pointers in C, which is a coding question under the introduction section. Jan 13, 2022 · Hello, I have been solving all two pointers tagged problems in last 3.

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