When To Use Two Pointer Approach, Solve LeetCode 1089: Duplicate Zer

When To Use Two Pointer Approach, Solve LeetCode 1089: Duplicate Zeros using a two-pointer technique. You must Dec 21, 2019 · Today we’ll be learning about the Two Pointer approach. It is the most efficient because it checks only half of the string without creating extra copies. Using Two Pointer Technique This method compares characters from both ends moving toward the center. 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. Jul 8, 2025 · By using two pointers to traverse data structures (typically arrays or strings), we can solve complex problems with optimal time complexity, often transforming O (n²) solutions into O (n) Aug 21, 2025 · The two pointer technique is a must-know for anyone preparing for coding interviews or competitive programming. 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). The name two pointers does justice in this case, as it is exactly as it sounds. Sep 6, 2023 · Two Pointer Technique Two Pointer Technique is a useful strategy for solving a variety of array-based problems in a more efficient manner. Finally, I’ll leave you 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 Jul 23, 2025 · Two pointers is really an easy and effective technique which is typically used for searching pairs in a sorted array. See examples, code, and suggested problems for practice. 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 . Jul 23, 2025 · By leveraging two pointers that traverse an array or sequence from different positions, this approach offers a way to solve problems that involve searching, manipulation, or optimization. 5 months, and wanted to share my findings/classifications here. If I go this route, I follow these rules: Sort an array of (value, index) pairs. 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. Base case: if the length of the string is 1 or less, it's considered a palindrome. Feb 2, 2025 · The two-pointer approach is another elegant and efficient technique often used in algorithm design, especially when working with arrays or lists. See the below for the two pointers highlighted in yellow. 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. It involves using two pointers or indices to solve problems by maintaining multiple positions in a sequence or array, often reducing time complexity and optimizing solutions for various coding challenges.

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