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"Given an array, find the int that appears an odd number of times.
There will always be only one integer that appears an odd number of times."
list suppose to have only one integer with odd count.
in this case these integer have odd count. (9, 2, 5, -2)
So i think, this is a wrong test case.
Issue re-raised with more details.
same problem in random tests
I have got the same problem.
Additionaly I got case with number '7' repeated 8th times, that was the content of vector, the test said that expected number is: 0, but I believe that description of the task is clear: "There will always be only one integer that appears an odd number of times.", so this is another bug.