class Solution:
def missingNumber(self, nums: List[int]) -> int:
l=len(nums)
for i in range(len(nums)):
l+=(i-nums[i])
return l
class Solution:
def missingNumber(self, nums: List[int]) -> int:
l=len(nums)
for i in range(len(nums)):
l+=(i-nums[i])
return l