# xor
class Solution(object):
def missingNumber(self, nums):
"""
:type nums: List[int]
:rtype: int
"""
xor, i = 0, 0
while i < len(nums):
xor = xor ^ i ^ nums[i]
i += 1
return xor ^ i
# sum
class Solution(object):
def missingNumber(self, nums):
"""
:type nums: List[int]
:rtype: int
"""
n = len(nums)
sums = (0 + n) * (n + 1) // 2
for num in nums:
sums -= num
return sums
# sort
class Solution(object):
def missingNumber(self, nums):
"""
:type nums: List[int]
:rtype: int
"""
nums.sort()
i = 0
for num in nums:
if num != i:
return i
i += 1
return i
LC-268 Missing Number
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