leetcode1394

 1 class Solution:
 2     def findLucky(self, arr: List[int]) -> int:
 3         dic = dict()
 4         n = len(arr)
 5         for i in range(n):
 6             if arr[i] not in dic:
 7                 dic[arr[i]] = 1
 8             else:
 9                 dic[arr[i]] += 1
10         maxnum = -1 
11         for k,v in dic.items():
12             if k == v and v > maxnum:
13                 maxnum = v
14         return maxnum