#1394

Find Lucky Integer in an Array

newbie · 220 · lc easy +17 · verified · 75.5% accepted · 1,618 likes · top 86%

Description

In an integer array arr, a lucky integer is one whose frequency of occurrence equals its own value. Return the largest lucky integer in arr, or -1 if none exists.

Example 1:

Input: arr = [2,2,3,4]

Output: 2

Explanation: The only lucky number in the array is 2 because frequency[2] == 2.

Example 2:

Input: arr = [1,2,2,3,3,3]

Output: 3

Explanation: 1, 2 and 3 are all lucky numbers, return the largest of them.

Example 3:

Input: arr = [2,2,2,3,3]

Output: -1

Explanation: There are no lucky numbers in the array.

Code

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class Solution:
    def findLucky(self, arr: List[int]) -> int:

class Solution:
    def findLucky(self, arr: List[int]) -> int: