Linked Lists and Hashtables

Learn fundamental data structures and algorithms through hands-on problem solving in this comprehensive tutorial covering linked lists and hashtables. Master graph cloning techniques using hashtable mappings to track node relationships and avoid infinite loops. Develop proficiency with the two-pointer technique and character frequency tracking to solve the minimum window substring problem efficiently. Explore both linear space and constant space approaches to cloning linked lists with random pointers, understanding the trade-offs between memory usage and implementation complexity. Practice the essential merge operation from merge sort by implementing the merge of two sorted linked lists. Build a complete LRU (Least Recently Used) cache system that demonstrates practical applications of both data structures working together. Strengthen your understanding of linked list manipulation through detailed explanations of both iterative and recursive approaches to reversing a singly linked list, with step-by-step breakdowns of the algorithms.