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Grokking the Coding Interview: Patterns for Coding Questions
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Solution: Largest Unique Number (easy)

Problem Statement

Given an array of integers, identify the highest value that appears only once in the array. If no such number exists, return -1.

Examples:

  1. Example 1:

    • Input: [5, 7, 3, 7, 5, 8]
    • Expected Output: 8
    • Justification: The number 8 is the highest value that appears only once in the array.

  2. Example 2:

    • Input: [1, 2, 3, 2, 1, 4, 4]
    • Expected Output: 3
    • Justification: The number 3 is the highest value that appears only once in the array.

  3. Example 3:

    • Input: [9, 9, 8, 8, 7, 7]
    • Expected Output: -1

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