AlgoSolveoRoadmap › Stage 5: Recursion & Linked Lists › Pattern 24 of 53
DSA pattern guide
Linked List — Reversal
Reverse all, part, or groups of a list, palindrome list.
Use it when
Reverse all, part, or groups of a list, palindrome list.
Key idea
Keep prev, curr and next. Flip curr.next to prev and step forward. For sublists, reconnect both ends.
Practice problems, in order
- Reverse a Linked ListEasy
- Palindrome Linked ListEasy
- Reverse Linked List IIMedium
- Maximum Twin Sum of a Linked ListMedium
- Swap Nodes in PairsMedium
- Rotate ListMedium
- Reverse Nodes in k-GroupHard
How to practise this pattern
- Read the problem and look for the signal above before writing any code.
- Say the brute force out loud, with its time complexity, then ask what work it repeats.
- Apply the key idea and write the optimised version yourself.
- If you're stuck for more than 10 minutes, take one small hint, not the full solution.
- Move to the next problem only when you can explain why this pattern fits.
Stuck on one of these?
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