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import operator
def lonely(a):
  return reduce(operator.__xor__,a)
 
n=input()
a=map(int,raw_input().split())
print lonely(a)

Success #stdin #stdout 0.01s 7740KB

stdin

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3
1 2 1

stdout

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https://ideone.com/MF1LoX

Lonely int

language:

Python (cpython 2.7.16)

created:

visibility:

secret

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