Available question text
Determine whether the array contains two equal elements whose indices differ by at most k — i.e., detect duplicates within a sliding window of size k+1 (array length up to 1e5, so an O(n) lookup-based approach is expected).
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Amazon
Leetcode 219. Contains Duplicate II
Reported Mar 13, 2025 · 1 source report
MID_LEVEL
Source snapshot: Nov 12, 2026
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Leetcode 219. Contains Duplicate II
Reported Jan 4, 2026 · 3 source reports
MID_LEVEL, SENIOR, STAFF
Source snapshot: Nov 12, 2026
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