Created
January 10, 2020 09:30
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| def solution(A): | |
| check_dict = {} | |
| for i in A: | |
| is_unpaired = check_dict.get(i, False) | |
| if is_unpaired: | |
| del check_dict[i] | |
| else: | |
| check_dict[i] = True | |
| return list(check_dict.keys())[0] |
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