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1207. Unique Number of Occurrences

作者:互联网

Given an array of integers arr, write a function that returns true if and only if the number of occurrences of each value in the array is unique.

 

Example 1:

Input: arr = [1,2,2,1,1,3]
Output: true
Explanation: 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:

HashMap的values() 方法返回一个values的set,形式为collections,所以可以转化为list

标签:map,arr,HashMap,1207,list,Number,values,Unique,true
来源: https://www.cnblogs.com/wentiliangkaihua/p/11624005.html