python
class Solution:
def singleNumber(self, nums: List[int]):
res = 0
for i in range(32):
count = 0
for num in nums:
count += (num >> i) & 1
if count % 3 != 0:
res += pow(2, i)
return res if (res>>31) & 1 == 0 else -((res^0xffffffff)+1)
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