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def single_number(arr):
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ones, twos = 0, 0
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for x in arr:
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ones, twos = (ones ^ x) & ~twos, (ones & x) | (twos & ~x)
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assert twos == 0
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return ones
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arr1 = [5, 3, 4, 3, 5, 5, 3]
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arr2 = [-1, 1, 1, -1, -1, 1, 0]
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print(single_number(arr1))
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print(single_number(arr2)) |