26. 268. Missing Number
class Solution:
def missingNumber(self, nums: List[int]) -> int:
n = len(nums)+1
if n<1: return None
real_sum = int(n*(n-1)/2)
now_sum = sum(nums)
return real_sum-now_sum
class Solution:
def missingNumber(self, nums: List[int]) -> int:
n = len(nums)+1
if n<1: return None
real_sum = int(n*(n-1)/2)
now_sum = sum(nums)
return real_sum-now_sum