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Solution: Contains Duplicate II

Explore the sliding window technique to solve the Contains Duplicate II problem. Understand how to track elements within a fixed range using a set to determine if duplicates exist within k indices, optimizing both time and space complexity. This lesson guides you through the problem-solving process and implementation details.

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:

  • 11 \leq nums.length 103\leq 10^3 ...