代码挑战:找到单一数字-Python3
【摘要】 Given a non-empty array of integers, every element appears twice except for one. Find that single one.方案一:class Solution: def singleNumber(self, nums: List[int]): result = nums[0] ...
Given a non-empty array of integers, every element appears twice except for one. Find that single one.
方案一:
class Solution:
def singleNumber(self, nums: List[int]):
result = nums[0]
i = 1
l = len(nums)
while i < l :
result = result ^ nums[i]
i = i + 1
return result
方案二:
class Solution:
def singleNumber(self, nums: List[int]):
s = set()
for x in nums :
if x in s :
s.remove(x)
else:
s.add(x)
return s.pop()
测试案例:
def test1_singleNumber(self):
s = Solution()
self.assertEqual(s.singleNumber([2,2,1]), 1)
def test2_singleNumber(self):
s = Solution()
self.assertEqual(s.singleNumber([4,1,2,1,2]), 4)
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