leetcode 347[medium]--Top K Frequent Elements
2017-12-20 00:29
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Given a non-empty array of integers, return the k most frequent elements.
For example,
Given
Note:
You may assume k is always valid, 1 ≤ k ≤ number of unique elements.
Your algorithm's time complexity must be better than O(n log n), where n is the array's size.
思路:此题考察的是hashtable的sorted知识点。
key:用列表元素的某个属性或函数进行作为关键字,有默认值,迭代集合中的一项;
reverse:排序规则. reverse
= True 降序 或者 reverse = False 升序,有默认值。
For example,
Given
[1,1,1,2,2,3]and k = 2, return
[1,2].
Note:
You may assume k is always valid, 1 ≤ k ≤ number of unique elements.
Your algorithm's time complexity must be better than O(n log n), where n is the array's size.
思路:此题考察的是hashtable的sorted知识点。
key:用列表元素的某个属性或函数进行作为关键字,有默认值,迭代集合中的一项;
reverse:排序规则. reverse
= True 降序 或者 reverse = False 升序,有默认值。
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