16 lines
436 B
Python
16 lines
436 B
Python
def choose_num(x, y):
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"""This function takes two positive numbers x and y and returns the
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biggest even integer number that is in the range [x, y] inclusive. If
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there's no such number, then the function should return -1.
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For example:
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choose_num(12, 15) = 14
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choose_num(13, 12) = -1
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"""
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if x > y:
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return -1
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if y % 2 == 0:
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return y
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if y - 1 >= x:
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return y - 1
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return -1 |