leetcode-第五场双周赛-1133-最大唯一数

第一次提交：

class Solution:
    def largestUniqueNumber(self, A: List[int]) -> int:
        dict = {}
        for i in A:
            if i not in dict:
                dict[i] = 1
            else:
                dict[i] += 1
        res = -1
        for i in dict:
            if dict[i]==1 and i>res:
                res = i
        return res

另：

class Solution:
    def largestUniqueNumber(self, A: List[int]) -> int:
        count=collections.Counter(A)
        tmp=sorted(count)[::-1]
        for i in tmp:
            if count[i]==1:
                return i
       
        return -1