Swapping Nodes in a Linked List
A medium-tier problem at 68% community acceptance, tagged with Linked List, Two Pointers. Reported in interviews at Snowflake and 1 others.
Swapping Nodes in a Linked List shows up in assessments from Snowflake and Nvidia, and it trips up candidates who overthink the mechanics. You know how to reverse a list or traverse it, but this problem asks you to swap two nodes by value without creating new nodes or reassigning data. The 60% acceptance rate means most people get a working solution, but a solid chunk miss edge cases or code inefficiently under time pressure. If this lands in your OA and you blank on the pointer juggling, StealthCoder runs invisible during screen share and hands you a clean implementation in seconds.
Companies that ask "Swapping Nodes in a Linked List"
Swapping Nodes in a Linked List is the kind of problem that decides whether you pass. StealthCoder reads the problem on screen and surfaces a working solution in under 2 seconds. Invisible to screen share. The proctor sees nothing. Made by a working FAANG engineer who treats the OA the way companies treat hiring: as a game with rules you should know.
Get StealthCoderThe trick is that you're not swapping values; you're rewiring pointers. Find both target nodes, then swap their positions in the list by updating the previous node's next pointer and handling the case where nodes are adjacent or the same node. Most candidates either hardcode the swap incorrectly or waste time tracking extra state. The two-pointer approach gets you there: one pass to locate both nodes and their predecessors, then one pass to execute the swap. Edge cases bite hard: nodes at the head, adjacent nodes, and non-existent nodes all demand careful handling. This is a medium-difficulty problem that feels like a hard problem the first time you see it. StealthCoder is your safety net if the pattern doesn't click live and you're running low on time.
Pattern tags
You know the problem.
Make sure you actually pass it.
Swapping Nodes in a Linked List recycles across companies for a reason. It's medium-tier, and most candidates blank under the timer. StealthCoder is the hedge: an AI overlay invisible during screen share. It reads the problem and surfaces a working solution in under 2 seconds. Made by a working FAANG engineer who treats the OA the way companies treat hiring: as a game with rules you should know. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Swapping Nodes in a Linked List interview FAQ
Is this problem still asked at Nvidia and Snowflake?+
Yes. Both companies have reported this problem in their assessments. It's a staple linked-list question for roles that care about pointer manipulation and edge-case handling. Expect it on the technical screen.
What's the main trap candidates fall into?+
Swapping values instead of pointers, or forgetting to update the predecessor node's next pointer. Some also over-complicate by building a hashmap when a two-pass solution with pointers is cleaner and faster.
How does this relate to the two-pointer technique?+
Two pointers help you find both target nodes in one or two passes. One pointer tracks the predecessor of each node; the other confirms position. This avoids repeated traversals and keeps space complexity O(1).
What happens if the two nodes are adjacent or the same?+
Adjacent nodes need special rewiring because swapping their pointers would create a cycle. If both nodes are the same value, no swap occurs. These cases are where most bugs hide.
Is this harder than reversing a linked list?+
Conceptually, yes. Reversal is a single pointer-flip pattern applied repeatedly. Swapping two nodes demands you track multiple pointers and handle independent cases. The 60% acceptance rate reflects this gap.
Want the actual problem statement? View "Swapping Nodes in a Linked List" on LeetCode →