<doocs>0268.Missing Number_1.py
def missingNumber( nums: List[int]) -> int:
    res = len(nums)
    for i, v in enumerate(nums):
        res ^= i ^ v
    return res
def sample_funcname ( var_0 : List [ int ] ) -> int :
    var_4 = len ( var_0 )
    for var_6 , var_7 in enumerate ( var_0 ) :
        var_4 ^= var_6 ^ var_7
    return var_4
