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Lonely Integer

Given an array of integers, where all elements but one occur twice, find the unique element.

Example:

  • inputArray = [1, 2, 3, 4, 3, 2, 1]
    • The unique element is 4.

Function Description:

  • Complete the lonelyInteger function in the editor below.
  • lonelyInteger has the following parameter(s):
    • int inputArray[n]: an array of integers

Returns:

  • int: the element that occurs only once

Input Format:

  • The first line contains a single integer, n, the number of integers in the array.
  • The second line contains n space-separated integers that describe the values in inputArray.

Constraints:

  • $1 \le n \le 100$
  • It is guaranteed that n is an odd number and that there is one unique element.
  • $0 \le inputArray[i] \le 100$, where $0 \le i \le n$.

Solution: