4
12
class Solution: def Sum(self, n ): if n==1: return 1 #分解 SumXor = (n+1)//2 #奇数 #SumXor = 0 i = 2 while i<=n: tmp = 2*i SumXor += (tmp-1) * ((n//i +1)//2) i = tmp return SumXor
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