What are the different types of linked lists?

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Linked Lists Interview Questions

  1. [JUNIOR] What is a linked list and how does it differ from an array?
  2. [MID] How do you reverse a singly linked list iteratively?
  3. [MID] How do you find the middle element of a singly linked list in one pass using the two-pointer technique?
  4. [MID] How do you detect a cycle in a linked list using Floyd's tortoise and hare algorithm?
  5. [JUNIOR] What are the different types of linked lists?
  6. [JUNIOR] What are the advantages and disadvantages of linked lists compared to arrays?
  7. [JUNIOR] What is the time complexity to insert and delete an element at the beginning, middle, and end of a singly linked list?
  8. [JUNIOR] What is the difference between a singly linked list and a doubly linked list?
  9. [MID] How do you reverse a singly linked list recursively?
  10. [MID] How do you find the N-th node from the end of a singly linked list in a single traversal?
  11. [MID] How do you merge two sorted linked lists into one sorted linked list?
  12. [MID] How do you find the intersection point of two singly linked lists?
  13. [SENIOR] How do you clone a linked list with both next and random pointers?
  14. [SENIOR] How do you implement an LRU cache using a linked list and hash map?
  15. [JUNIOR] What does the node of a linked list consist of?
  16. [JUNIOR] What is the time complexity to access the k-th element in a linked list?
  17. [JUNIOR] How do you insert a node at the beginning of a singly linked list?
  18. [JUNIOR] How do you traverse a linked list and print the data in each node?
  19. [MID] How do you find the starting node of a cycle in a linked list?
  20. [MID] How do you remove the N-th node from the end of a linked list?
  21. [MID] How do you delete a node from a singly linked list given only a pointer to that node?
  22. [MID] How do you check if a linked list is a palindrome?
  23. [SENIOR] How do you reverse nodes in groups of K in a linked list?
  24. [SENIOR] How do you sort a linked list using merge sort in O(n log n) time?
  25. [SENIOR] How do you merge K sorted linked lists efficiently?
  26. [JUNIOR] Why is binary search not efficient for linked lists?
  27. [JUNIOR] What is a circular linked list and how does it differ from a linear linked list?
  28. [JUNIOR] How do you insert a node at the end of a singly linked list?
  29. [JUNIOR] How do you delete a node from the beginning of a singly linked list?
  30. [JUNIOR] How do you calculate the length of a singly linked list iteratively and recursively?
  31. [JUNIOR] How do you implement a stack using a linked list?
  32. [MID] How do you reverse a doubly linked list?
  33. [MID] How do you remove a loop from a linked list once detected?
  34. [MID] How do you remove duplicates from a sorted linked list?
  35. [MID] How do you remove duplicates from an unsorted linked list?
  36. [MID] How do you add two numbers represented by linked lists?
  37. [SENIOR] How do you reverse a sublist from position m to n within a linked list?
  38. [SENIOR] How do you reorder a linked list in the pattern L0, Ln, L1, Ln-1, and so on?
  39. [SENIOR] How do you flatten a multilevel linked list where each node may have a child pointer?
  40. [SENIOR] How do you find pairs with a given sum in a sorted doubly linked list?
  41. [EXPERT] How do you implement an LFU cache using linked lists?
  42. [JUNIOR] What are the real-world applications of linked lists?
  43. [JUNIOR] How do you insert a node into a sorted linked list in the correct position?
  44. [JUNIOR] How do you delete a node from the end of a singly linked list?
  45. [JUNIOR] How do you search for a given element in a linked list?
  46. [JUNIOR] What is the difference between a stack and a linked list?
  47. [JUNIOR] How do you implement a queue using a linked list?
  48. [MID] How do you find the length of a loop in a linked list?
  49. [MID] How do you swap every two adjacent nodes in a linked list?
  50. [MID] Why is merge sort preferred over quicksort for sorting linked lists?
  51. [SENIOR] How do you reverse alternate K nodes in a linked list?
  52. [SENIOR] How do you partition a linked list around a given value x?
  53. [SENIOR] How do you rotate a linked list by K positions?
  54. [SENIOR] How do you flatten a linked list where each node contains a sub-list while keeping the result sorted?
  55. [SENIOR] How do you convert a binary tree to a doubly linked list?
  56. [EXPERT] How would you create a memory-efficient doubly linked list using XOR of addresses?
  57. [EXPERT] What is a skip list, how does it relate to linked lists, and what are its time complexity characteristics?
  58. [JUNIOR] Which type of memory allocation is used for linked lists and why?
  59. [JUNIOR] What is a dummy or sentinel node in a linked list and when is it useful?
  60. [MID] How do you delete the middle node of a linked list?
  61. [MID] How do you check if two linked lists are identical?
  62. [MID] How do you segregate odd and even positioned nodes in a linked list?
  63. [SENIOR] How do you multiply two numbers represented by linked lists?
  64. [SENIOR] How do you convert a sorted doubly linked list to a balanced binary search tree?
  65. [EXPERT] How do you find the length of a linked list that contains a cycle?
  66. [EXPERT] How would you design a linked list that supports O(1) concatenation of two lists?
  67. [EXPERT] How does cache locality affect linked list performance compared to arrays, and what strategies can mitigate this?
  68. [JUNIOR] How do you count the occurrences of a given value in a linked list?
  69. [JUNIOR] What is a memory leak in the context of linked lists and how can it be prevented?
  70. [MID] How do you sort a linked list of 0s, 1s, and 2s?
  71. [MID] How do you split a circular linked list into two halves?
  72. [SENIOR] How do you swap the K-th node from the beginning with the K-th node from the end?
  73. [EXPERT] How do you count triplets in a sorted doubly linked list that sum to a given value in O(n squared) time and O(1) space?
  74. [EXPERT] How do you extract all leaf nodes from a binary tree into a doubly linked list?
  75. [EXPERT] Given a linked list sorted by absolute values, how do you sort it by actual values in O(n) time?
  76. [MID] How do you convert a singly linked list into a circular linked list?
  77. [MID] How do you remove all occurrences of a given key from a linked list?
  78. [SENIOR] How do you delete N nodes after every M nodes in a linked list?
  79. [EXPERT] How do you add two polynomial expressions represented as linked lists?
  80. [EXPERT] Given a linked list of coordinates forming horizontal and vertical lines, how do you remove intermediate collinear points?
  81. [EXPERT] How do you find the intersection node of two circular linked lists?