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36 lines
446 B
Python
36 lines
446 B
Python
def problem_p03129(input_data):
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n, k = list(map(int, input_data.split()))
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if n == 1 or n == 2:
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if k == 1:
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return "YES"
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else:
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return "NO"
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elif n % 2 == 0:
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cnt = n / 2
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if cnt >= k:
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return "YES"
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else:
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return "NO"
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else:
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cnt = n // 2 + 1
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if cnt >= k:
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return "YES"
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else:
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return "NO"
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