When To Use Two Pointer Approach, Learn how to use two pointers tech

When To Use Two Pointer Approach, Learn how to use two pointers technique to iterate through a data set in a controlled way and solve problems that involve searching, comparing, or finding patterns. It's the use of two different pointers (usually to keep track of array or string indices) to solve a problem involving said indices with the benefit of saving time and space. Common patterns in the two-pointer approach involve: Two pointers each starting from the beginning and the end until they both meet Jan 7, 2024 · Recognizing Two Pointer Technique: The problem hints at the potential use of Two Pointers because it involves searching for a pair of elements that meet a specific condition (add up to the target). Oct 28, 2025 · A palindrome is a string that reads the same forward and backward. At every step during the iteration, we will search for the quadruplets similar to Triplet Sum to Zero whose sum is equal to the given Nov 14, 2025 · For example, "int *ptr;" declares a pointer to an integer. The two pointer approach is an efficient algorithmic technique used in computer science and programming. Jan 13, 2023 · Approach : In reverse function we take two pointers one pointing at the beginning of the array, other pointing at end of the array. Sep 3, 2020 · Let's learn about the Two Pointers technique to algorithm templates and two main variations of this technique. Given a sorted array A (sorted in ascending order), having N integers, find if there exists any pair of elements (A [i], A [j]) such that their sum is equal to X. Most people solve Max Consecutive Ones using nested loops This video shows the O (n) sliding window approach using two pointers — simple, clean, and interview-ready. If I go this route, I follow these rules: Sort an array of (value, index) pairs. The contents of the memory location pointed by these two pointers are swapped and then the value of first pointer is increased and that of second pointer is decreased . Jan 21, 2023 · One of these approaches goes by Two-Pointers and is the subject of this video. Jul 23, 2025 · Two pointers is really an easy and effective technique which is typically used for searching pairs in a sorted array. In this article, we will explore the two-pointer approach, its applications, and when it is most effective. Step 3: Use Two Pointers to Find Pairs Jul 12, 2025 · Two-Pointers approach: This problem follows the Two Pointers pattern and shares similarities with Triplet Sum to Zero. Whenever an array question deals with finding two numbers in an array that satisfy a certain condition, either The naive approach to this problem uses two-pointers i and j in a nested for-loop to consider each pair in the input array, for a total of O (n 2) pairs considered. LeetCode Problems solved in this video: Thanks for Watching! If you found this video helpful, check other Geekific Jul 23, 2025 · Two pointers is really an easy and effective technique which is typically used for searching pairs in a sorted array.

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