Write a program in C++ that lets the user input an odd number of positive integers ( each separated by one space). Assume that each integer except for one, the exclusive integer, appears an even...

Write a program in C++ that lets the user input an odd number of positive integers ( each separated by one space). Assume that each integer except for one, the
exclusive
integer, appears an even number of times in the input. The program should output the exclusive integer.

Example:

Enter integers: 2 1 55 3 2 1 4 4 2 2 55

Exclusive: 3