Question: 6.24 LAB: Unique Number Problem description: You will need to write a function int uniqueNumber(int array). The input of this function is an int array.

 6.24 LAB: Unique Number Problem description: You will need to write

6.24 LAB: Unique Number Problem description: You will need to write a function int uniqueNumber(int array). The input of this function is an int array. This array contains only positive integers. Given that every element in this array appeared twice, except for one unique element which appeared only once. Your job is to find and return this unique number. If every number in this array appeared twice, return -1

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