How to Solve Find Lucky Integer in an Array Problem
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Find Lucky Integer in an Array
Given an array of integers arr, a lucky integer is an integer that has a frequency in the array equal to its value. Return the largest lucky integer in the array. If there is no lucky integer return -...
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Understanding the Find Lucky Integer in an Array Problem
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Problem Statement
Given an array of integers arr, a lucky integer is an integer that has a frequency in the array equal to its value. Return the largest lucky integer in the array. If there is no lucky integer return -1.
Find Lucky Integer in an Array
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Examples
arr = [2,2,3,4]2The only lucky number in the array is 2 because frequency[2] == 2.
arr = [1,2,2,3,3,3]31, 2 and 3 are all lucky numbers, return the largest of them.
arr = [2,2,2,3,3]-1There are no lucky numbers in the array.
Constraints
1 <= arr.length <= 5001 <= arr[i] <= 500How Interview Coder Helps with Leetcode Problems
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