商家可以更改order total吗？比如coupons violate their policy？# Money - 海外理财
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Write a function that takes two parameters: (1) a String representing a text
document and (2) an integer providing the number of items to return.
Implement the function such that it returns a list of Strings ordered by
word frequency, the most frequently occurring word first.Your solution
should run in O(n) time where n is the number of characters in the document.
这个是不是就是设置个大小为k的min-heap，先扫一遍统计每个word的frequency，放到
hashmap中，然后在扫一遍hashmap，然后放到min-heap中。那这种做法的复杂度是O(n
+ mlogk + klogk)是吧，也就是要求的O(n),因为k是输入的，m是word的个数。谢谢。
document and (2) an integer providing the number of items to return.
Implement the function such that it returns a list of Strings ordered by
word frequency, the most frequently occurring word first.Your solution
should run in O(n) time where n is the number of characters in the document.
这个是不是就是设置个大小为k的min-heap，先扫一遍统计每个word的frequency，放到
hashmap中，然后在扫一遍hashmap，然后放到min-heap中。那这种做法的复杂度是O(n
+ mlogk + klogk)是吧，也就是要求的O(n),因为k是输入的，m是word的个数。谢谢。