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Distinct Intensity Counts Solution

Problem Statement

You are given an array of integers `intensities` representing signal strengths. Determine the number of unique signal strengths in the given sequence.

Example 1
Input
[1, 2, 2, 3, 4, 4, 5]
Output
5

Explanation: The unique signal strengths are 1, 2, 3, 4, and 5.

Constraints

  • 1 <= intensities.length <= 10^5
  • -10^6 <= intensities[i] <= 10^6
  • intensities contains at least one integer

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