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def single_number(arr):
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result = 0
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for i in arr:
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result ^= i
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return result
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arr1 = [5, 3, 4, 3, 4]
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arr2 = [3, 2, 5, 2, 1, 5, 3]
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print(single_number(arr1))
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print(single_number(arr2)) |