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Linked Lists
10 problems · Easy to Medium · Linked list patterns
Linked list problems test your ability to manipulate pointers precisely without losing references — a skill that's harder than it sounds under interview pressure. This track covers the full range of classic linked list patterns: reversal, cycle detection with Floyd's two-pointer algorithm, palindrome checking, and merging, culminating in the challenging Merge k Sorted Lists problem.
Why it matters:
Linked list problems are a reliable signal of whether a candidate can reason carefully about memory and pointer state. Interviewers use them specifically because the operations are conceptually simple but easy to get wrong in implementation — making them an efficient filter for attention to detail and clean code under pressure.
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