class Solution(object):
def countOdds(self, low, high):
return (high +1 )//2 - low//2
思路：直接计算 high在内往下有几个奇数 减去 low以下奇数的个数
结果只能说一般：
class Solution(object):
def countOdds(self, low, high):
return (high +1 )//2 - low//2
思路：直接计算 high在内往下有几个奇数 减去 low以下奇数的个数
结果只能说一般：
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