leetcode 268. Missing Number 缺失數字 python 多種思路，一行程式碼

阿新 • • 發佈：2019-02-15

class Solution:
    def missingNumber(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """

        # Approach #1   遍歷速度太慢
        # return  [i for i in range(len(nums)+1) if i not in nums][0]

        # Approach #2   集合操作
        # return  list(set(list(range(len(nums)+1))) - set(nums))[0]   



        # Approach #3 從數學角度考慮
        # return int(len(nums)*(len(nums)+1)/2 - sum(nums)) 


        # Approach #4 從數學角度考慮
        return sum(range(len(nums)+1)) - sum(nums)

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class Solution: def missingNumber(self, nums): """ :type nums: List[int]

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