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Articles tagged with #linked-list
Hard — Linked List | Recursion | Pointers The Problem Given the head of a linked list, reverse the nodes of the list k at a time, returning the modified list. If the number of remaining nodes is not a multiple of k, leave the remaining nodes as they ...
Medium — Linked List | Two Pointers | Recursion The Problem Given the head of a singly linked list, reorder it by alternating nodes from the beginning and end of the list in-place. Approach The algorithm uses a three-step approach: first find the mid...
If you've used Python Tutor to understand code execution, you already know how powerful visual tracing can be. But if you've tried using it for LeetCode problems — especially linked lists and trees — you've probably hit its limits. What Python Tutor ...
Easy — Linked List | Two Pointers | Recursion | Merge The Problem Merge two sorted linked lists into one sorted linked list by splicing together the nodes of the first two lists. Approach Use a dummy node to simplify edge cases and maintain a current...
Medium — Hash Table | Linked List | Design | Doubly-Linked List The Problem Design and implement a data structure for Least Recently Used (LRU) cache that supports get and put operations in O(1) time complexity. Approach Use a combination of a hash m...
Easy — Linked List | Two Pointers | Hash Table The Problem Given the head of a linked list, determine if the linked list has a cycle in it. A cycle exists if there is some node in the list that can be reached again by continuously following the next ...
