题解 | #缺失的第一个正整数#

#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param nums int整型一维数组 
# @return int整型
#
class Solution:
    def minNumberDisappeared(self , nums: List[int]) -> int:
        # write code here
        m = dict()
        res = 1

        for i in nums:
            if i not in m:
                m[i] = 1
            else:
                m[i] = m[i] + 1

        while res in m:
            res += 1

        return res