Grokking 75: Top Coding Interview Questions
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Contains Duplicate II (easy)
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Problem Statement

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Problem Statement

Given an array of integers nums and an integer k, return true if there are any two different indices i and j in the array where nums[i] == nums[j] and abs(i - j) <= k. Otherwise, return false.

Examples

Example 1:

  • Input: nums = [10, 20, 10, 30], k = 1
  • Output: false
  • Explanation: The number 10 appears at positions 0 and 2. The difference between these positions is 2, which is not less than k.

Example 2:

  • Input: nums = [5, 15, 25, 5, 35], k = 3
  • Output: true
  • Explanation: The number 5 appears at positions 0 and 3. The difference between these positions is 3, which is equal to k.

Example 3:

  • Input: nums = [7, 8, 9, 7, 10, 11], k = 4
  • Output: true
  • Explanation: The number 7 appears at positions 0 and 3. The difference between these positions is 3, which is less than to k.

Constraints:

  • 1 <= nums.length <= 10<sup>5</sup>
  • -10<sup>9</sup> <= nums[i] <= 10<sup>9</sup>
  • 0 <= k <= 10<sup>5</sup>

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Python3
Python3
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Problem Statement

Examples

Try it yourself