25 lines
298 B
Python
25 lines
298 B
Python
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def problem_p03698(input_data):
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import copy
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s = eval(input_data)
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ss = list(s)
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sss = copy.copy(ss)
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n = len(ss)
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ans = "yes"
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for i in range(n):
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sss = copy.copy(ss)
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sss.remove(sss[i])
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if ss[i] in sss:
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ans = "no"
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return ans
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