题解 | #数组中只出现一次的数（其它数出现k次）#

python只能调用ctypes来做吹了位运算的结果了

class Solution:
    def foundOnceNumber(self , arr , k ):
        # write code here
        res = 0
        for i in range(32):
            cur = 0
            for t in arr:
                cur += (t >> i) & 1
            res ^= (cur % k) << i
        import ctypes
        return ctypes.c_int(res).value