Two pointer algorithm questions, Free coding practice with solutions
Two pointer algorithm questions, . Depending on the questions you encounter, you need to implement the answer differently. Practice 3600+ coding problems and tutorials. This is the best place to expand your knowledge and get prepared for your next interview. Jul 26, 2025 路 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. Jul 23, 2025 路 The Two Pointer Approach is a powerful and efficient technique used to solve problems involving sorted arrays, searching, and optimization. In one scenario, one pointer starts from the beginning and the other pointer starts from the end, moving toward one another until they Aug 2, 2025 路 M Umair Ullah Posted on Aug 2, 2025 What I Wish I Knew Before Learning the Two Pointer Algorithm # dsa # programming # cpp # 2pointers 馃殌 Mastering the Two Pointers Technique in DSA The Two Pointers technique is one of the most efficient and elegant solutions for solving array and string problems that involve searching, partitioning, or 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. Check the sum of the elements at these two pointers: If the sum equals the target, we’ve found the pair. Jul 8, 2025 路 The two-pointer technique is one of the most elegant and efficient algorithmic patterns in computer science. There are two common scenarios in which the two-pointer approach is used. If you are preparing for FAANG or Master data structures and algorithms with 50000+ DSA problems, interview questions, coding challenges, and step-by-step solutions. Master programming challenges with problems sorted by difficulty. 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鈦). By using two pointers to traverse data structures (typically arrays or strings), we can Since "two pointers" is kind of a broad topic, there is no singular way to implement it. Free coding practice with solutions. If the sum is less than the target, move the left pointer to the right to increase the sum. Welcome back to the DSA series! Today we are solving one of the most fundamental string-based interview questions: Valid Palindrome (GeeksforGeeks / LeetCode 125). Jan 18, 2026 路 Learn how to solve the 3Sum problem to find all unique triplets with zero sum using brute force, hashing, and optimal two-pointer. Generally speaking, a two pointer algorithm has these characteristics: Two moving pointers, regardless of directions, moving dependently or independently; The Two Pointer pattern is one of the most important Data Structures & Algorithms techniques used in problems like Two Sum, 3Sum, Container With Most Water, and many LeetCode interview questions. As the name suggests, the two-pointer approach can be used to help process two elements per loop, instead of just one. For the purpose of this article, a pointer is an index of an array. Feb 13, 2026 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 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 Level up your coding skills and quickly land a job.
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