# Find the unique number
"""
There is an array with some numbers. All numbers are equal except for one. Try to find it!

find_uniq([ 1, 1, 1, 2, 1, 1 ]) == 2
find_uniq([ 0, 0, 0.55, 0, 0 ]) == 0.55
It’s guaranteed that array contains at least 3 numbers.

The tests contain some very huge arrays, so think about performance.
"""

def find_uniq(arr):
    # your code here
    n, m = set(arr)
    return n if arr.count(n) == 1 else m  # n: unique integer in the array
