Coding & Algorithms (DSA)
Two Pointers & Sliding Window
6 practice questions. Free questions open a full answer guide; the rest unlock with Pro.
- Walk me through how a variable-size sliding window finds the longest substring without repeating characters, and why it runs in linear time.
- How do you decide between the two-pointers technique and a sliding window, and what property of the problem has to hold for a single linear pass to be correct?Go Pro
- How do you decide whether a problem calls for the two-pointers technique or the sliding-window technique?Go Pro
- Walk me through how you'd find the length of the longest substring without repeating characters, and what makes the window in your approach 'variable' rather than fixed.Go Pro
- Explain why a sliding-window solution with two moving pointers runs in linear time even though it has nested-looking loops, and how you'd recognize that a problem is actually a sliding-window candidate.Go Pro
- When does the two-pointer technique require the input to be sorted first, and how does that sorting cost change your decision about whether two-pointers is actually the best approach?Go Pro
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