Lesson overview · Free interview practice

Linked List Reversal

Reverse linked lists in-place.

Topics in the full lesson
  • Concept and Use Cases
  • When to Use
  • Time and Space Complexity
  • Reversing the Entire Linked List
  • Reversing a Part of the Linked List
  • Reversing Nodes in k-Sized Groups

Practice Problems

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CodingMedium

Reverse Linked List II

Question

Given the head of a singly linked list and two integers left and right (with 1 <= left <= right <= length), reverse the nodes from position left to position right (inclusive) and return the modified list. Solve in one pass.

Take a moment to think about this before revealing the answer

Explain your reasoning or try an implementation before comparing answers.

Practice on LeetCode
CodingMedium

Swap Nodes in Pairs

Question

Given a linked list, swap every two adjacent nodes and return its head. You must solve the problem without modifying the values in the nodes — only node connections may be changed.

Take a moment to think about this before revealing the answer

Explain your reasoning or try an implementation before comparing answers.

Practice on LeetCode
CodingHard

Reverse Nodes in k-Group

Question

Given the head of a linked list, reverse the nodes k at a time and return the new head. If the number of nodes is not a multiple of k, leave the final group of fewer than k nodes as-is. Only the node links may be changed, not the values.

Take a moment to think about this before revealing the answer

Explain your reasoning or try an implementation before comparing answers.

Practice on LeetCode

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