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Counting Elements (easy)
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Problem Statement

Given a list of integers, determine the count of numbers for which there exists another number in the list that is greater by exactly one unit.

In other words, for each number x in the list, if x + 1 also exists in the list, then x is considered for the count.

Examples:

  1. Example 1:

    • Input: [4, 3, 1, 5, 6]
    • Expected Output: 3
    • Justification: The numbers 4, 3, and 5 have 5, 4, and 6 respectively in the list, which are greater by exactly one unit.

  2. Example 2:

    • Input: [7, 8, 9, 10]
    • Expected Output: 3

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