leetcode 1394. Find Lucky Integer in an Array
2022-02-10 18:26 作者:您是打尖儿还是住店呢 | 我要投稿
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.
Example 1:
Input: arr = [2,2,3,4]Output: 2Explanation: The only lucky number in the array is 2 because frequency[2] == 2.
Example 2:
Input: arr = [1,2,2,3,3,3]Output: 3Explanation: 1, 2 and 3 are all lucky numbers, return the largest of them.
Example 3:
Input: arr = [2,2,2,3,3]Output: -1Explanation: There are no lucky numbers in the array.
Runtime: 10 ms, faster than 13.49% of Java online submissions for Find Lucky Integer in an Array.
Memory Usage: 43.6 MB, less than 11.76% of Java online submissions for Find Lucky Integer in an Array.
