leetcode1207. Unique Number of Occurrences
2022-03-26 09:46 作者:您是打尖兒還是住店呢 | 我要投稿
Given an array of integers?arr, return?true?if the number of occurrences of each value in the array is?unique, or?false?otherwise.
?
Example 1:
Input: arr = [1,2,2,1,1,3]Output: trueExplanation:?The value 1 has 3 occurrences, 2 has 2 and 3 has 1. No two values have the same number of occurrences.
Example 2:
Input: arr = [1,2]Output: false
Example 3:
Input: arr = [-3,0,1,-3,1,1,1,-3,10,0]Output: true
?
Constraints:
1 <= arr.length?<= 1000-1000 <= arr[i] <= 1000
Runtime:?2 ms, faster than?82.86%?of?Java?online submissions for?Unique Number of Occurrences.
Memory Usage:?42.8 MB, less than?7.88%?of?Java?online submissions for?Unique Number of Occurrences.
map遍歷一遍，然后對value的大小判斷大于1就false；
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