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Solution: Contains Duplicate II

Explore how to solve the Contains Duplicate II problem by using a sliding window of size k to track elements in an array. Understand maintaining a set to identify duplicates within a limited range in O(n) time while managing space complexity effectively.

Statement

You are given an integer array, nums, and an integer k. Determine whether two distinct indices, i and j, are in the array, such that nums[i] == nums[j] and the absolute difference between i and j is at most k. Return TRUE if such indices exist; otherwise, return FALSE.

Constraints:

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