Two Pointers Medium. Find two lines that together with the x-axis form a container,

Find two lines that together with the x-axis form a container, such that the container contains the most water. 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. . 🚀 It utilizes two index variables (pointers) to Oct 15, 2021 · 先前有一篇文章談到two pointer的技巧，不過最近在嘗試寫linked list的題目，也常常碰到需要使用two pointer的情況，發現自己對這個技巧還是很生疏，因此咬著牙多翻了幾道比較簡單的題目來練習，才發現two pointer其實還有很多種應用方式呢。 Feb 12, 2025 · Quiz on Two Pointer Technique for DSA Quiz will help you to test and validate your DSA knowledge. Usually the two pointer approach and sorting Jul 22, 2024 · The two-pointer technique uses two pointers (or indices) that traverse the data at the same time. Two pointers is a common interview technique often used to solve certain problems involving an iterable data structure, such as an array. I have solved more than 500+ questions on LeetCode and have current ratings of 1572 . You just have to assess all the given options and click on the correct answer. Jan 29, 2024 · The two-pointer technique is a strategy used for efficiently solving problems related to arrays or linked lists. By strategically placing and moving two pointers (or indices) within the input, you can reduce the need for nested loops, often improving time complexity from O (n^2) to O (n) or O The two pointer technique improves algorithm efficiency by reducing time complexity, often from O (n^2) to O (n). We create two pointers — a left-pointer and a right-pointer. The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2. Nov 7, 2025 · The Two Pointer technique is a pattern built on simple movement and precise logic. Conclusion The Two Pointers technique is a must-have weapon in a competitive programmer's arsenal. If there is no next right Jul 2, 2023 · T he Two Pointers technique is commonly used to solve problems involving arrays or strings by maintaining two pointers that traverse the data structure in a specific manner. There are a range of different variations of this that can be applied to 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. 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. 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. With enough practice, you will start recognizing patterns where this technique applies immediately, saving both time and complexity. Dec 21, 2019 · Remember earlier we said two pointers were useful to look at 2 different indices of the input to make a decision. It involves maintaining two pointers that traverse the array based on certain 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. From handling sorted arrays to dealing… Jan 31, 2021 · The two pointers pattern optimizes algorithms that handle strings, sorted arrays, or linked lists by using two pointers to keep track of indices, simplify the logic, and save time and space. Jul 8, 2025 · The two-pointer technique is one of the most elegant and efficient algorithmic patterns in computer science. Sep 6, 2023 · Two Pointers Technique The two-pointer technique is a fundamental algorithmic approach that plays a pivotal role in optimizing solutions to specific types of problems in computer science. This is why the two-pointer technique is efficient. These patterns can be used for string or array questions. Return the maximum amount of water a container can Jun 25, 2024 · There are many Leetcode problems you can solve with two pointer technique and its variations. The quiz contains 13 questions. As the name suggests, this technique uses two (or more) pointers that traverse through the structure. Dec 13, 2024 · Overview The Two Pointers pattern is a common algorithmic technique used to solve a variety of problems efficiently, especially those involving arrays or strings. Aug 15, 2020 · The two-pointer technique is a near necessity in any software developer’s toolkit, especially when it comes to technical interviews. length. Aug 3, 2022 · One of the algorithms or techniques widely used for both array and linked list problems is the “two-pointer technique”. The binary tree has the following definition: struct Node { int val; Node *left; Node *right; Node *next; } Populate each next pointer to point to its next right node. Common patterns in the two-pointer approach entail: Two pointers, each starting from the beginning and the end until they both meet. In this guide, we’ll cover the basics so that you know when Jan 31, 2021 · The two pointers pattern optimizes algorithms that handle strings, sorted arrays, or linked lists by using two pointers to keep track of indices, simplify the logic, and save time and space. One pointer moving at a slow pace, while the other pointer moves at twice the speed. As a self-taught developer (no theoretical CS background), learning data … 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. 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 / … Apr 17, 2025 · The Two Pointer Technique is a powerful pattern for solving problems that involve scanning arrays or strings from both ends. Usually the two pointer approach and sorting Apr 4, 2024 · The two-pointer technique is a widely used approach to solving problems efficiently, particularly scenarios involving arrays or linked… Feb 8, 2024 · The two-pointer technique is a pattern where two pointers iterate over the data structure in tandem or separately until they satisfy a… In this comprehensive guide, we delve into the realm of Two Pointers problem-solving on LeetCode. Aug 20, 2024 · Two pointer techniques and Rust examples The two-pointer approach is a popular algorithmic technique used in programming to solve problems involving iterating over arrays, lists or linked lists. We are able to process two elements per loop instead of just one. So, I’m putting together this list of 20 questions that I believe are Sep 27, 2023 · When it comes to solving complex problems involving arrays, linked lists, or even strings, the Two-Pointer Algorithm emerges as a powerful technique. Among the various techniques to optimize code performance, the “two pointers”… Aug 11, 2020 · Two-pointer technique is commonly used to solve array problems very efficiently. 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. This approach is efficient in solving problems where you Jan 29, 2024 · The two-pointer technique is a strategy used for efficiently solving problems related to arrays or linked lists. By using two pointers that move through the data structure simultaneously, it eliminates the need for nested loops, making solutions more optimized and faster, especially for problems involving arrays, linked lists, or strings. By using two pointers to traverse data structures (typically arrays or strings), we can Feb 6, 2023 · Two pointer algorithm is a technique used to traverse through an array or a list where you use two pointers that move towards each other. Jul 22, 2024 · The two-pointer technique uses two pointers (or indices) that traverse the data at the same time. It involves maintaining two pointers that traverse the array based on certain For string problems (like "at most K changes"), two pointers + frequency counters are your friends. Comparing the letters at two indices can yield two outcomes. Jan 29, 2024 · Two Pointer 🚀| Summary with practice questions Sheet (C++) on LeetCode Hi, my name is Mahesh. Valid Palindrome class Solution { public: bool isPalindrome (string s) { int left =0; int right = s. The two-pointer technique will 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. It’s memory-efficient and helps reduce nested loops to linear solutions. 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. The pointers i & j cannot be same. Can you solve this real interview question? Container With Most Water - You are given an integer array height of length n. There are n vertical lines drawn such that the two endpoints of the ith line are (i, 0) and (i, height[i]). In this guide, we’ll cover the basics so that you know when Jul 8, 2025 · The two-pointer technique is one of the most elegant and efficient algorithmic patterns in computer science. 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. Can you solve this real interview question? Populating Next Right Pointers in Each Node - You are given a perfect binary tree where all leaves are on the same level, and every parent has two children. Oct 1, 2024 · In the world of algorithm design, efficiency is paramount. Aug 3, 2022 · Two pointer techniques — a visual tutorial Three animated two-pointer techniques to solve Three different problems. Dec 13, 2024 · By strategically placing and moving two pointers (or indices) within the input, you can reduce the need for nested loops, often improving time complexity from O (n^2) to O (n) or O (nlogn). It covers a variety of questions, from basic to advanced. So, I’m putting together this list of 20 questions that I believe are Dec 21, 2021 · Two Pointer search Algorithm used to refer searching algorithms that loops over the given data structure in linear time and finds the desired solution. It relies on two reference variables that travel through… Feb 8, 2024 · The two-pointer technique is a pattern where two pointers iterate over the data structure in tandem or separately until they satisfy a… Lately, I’ve been grinding on LeetCode, specifically on two-pointer questions 🚀. Whenever an array question deals with finding two numbers in an array that satisfy a certain condition, either Dec 16, 2020 · Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. Return the indices of the two numbers, index1 Dec 19, 2025 · If Charbonnet had recovered the ball at the 1-yard line and then stepped into the end zone, the two-pointer wouldn't have counted because the ball would have been placed where the recovery happened. Depending on the difficulty, these pointers may go towards, away from, or in the same direction. You can find a list here… Apr 3, 2025 · Leetcode 150- Act II: Two Pointers 125. Nov 8, 2025 · The Two Pointer technique is an algorithmic pattern designed for efficiently processing linear data structures, such as arrays or strings. This is the best place to expand your knowledge and get prepared for your next interview. 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… 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 Oct 1, 2024 · In the world of algorithm design, efficiency is paramount. I’ve been really obsessed with it. Among the various techniques to optimize code performance, the “two pointers”… Feb 1, 2022 · The Solution First, we sort the array in ascending order so that we can use the two-pointer method in the following way. By using two pointers to traverse data structures (typically arrays or strings), we can Dec 21, 2021 · Two Pointer search Algorithm used to refer searching algorithms that loops over the given data structure in linear time and finds the desired solution. This algorithmic approach involves managing Feb 9, 2021 · Discussing Two Pointers algorithm, and how to use its template code to solve multiple interview questions in C# for a deeper understanding of Data Structure and Algorithms. I have 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… The two pointers technique is a technique used to iterate through a data set, typically an array or a list, in a controlled way. size () -1; // inside this only … Lately, I’ve been grinding on LeetCode, specifically on two-pointer questions 🚀. Level up your coding skills and quickly land a job. It does not have to be physically using two pointers. Let these two numbers be numbers[index1] and numbers[index2] where 1 <= index1 < index2 <= numbers. The Two Pointers technique is one of the most elegant and powerful algorithmic paradigms in computer science, offering an optimal approach to solve problems involving ordered data structures and 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 .

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