First Occurrence of Unique Signals Solution

Problem Statement

You are given a sequence of numbers representing sonar signals. Identify the first occurrence of each unique signal in the sequence.

Constraints

• {"description":"1 <= signals.length <= 10^5","details":"The length of the input sequence is within the range of 1 to 10^5"}
• {"description":"1 <= signals[i] <= 10^6","details":"Each signal is a positive integer within the range of 1 to 10^6"}

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