面试题 16.02 单词频率

2022-07-28
1分钟阅读时长

面试题 16.02 单词频率

设计一个方法,找出任意指定单词在一本书中的出现频率。

你的实现应该支持如下操作:

  • WordsFrequency(book)构造函数,参数为字符串数组构成的一本书
  • get(word)查询指定单词在书中出现的频率

示例:

WordsFrequency wordsFrequency = new WordsFrequency({"i", "have", "an", "apple", "he", "have", "a", "pen"});
wordsFrequency.get("you"); //返回0,"you"没有出现过
wordsFrequency.get("have"); //返回2,"have"出现2次
wordsFrequency.get("an"); //返回1
wordsFrequency.get("apple"); //返回1
wordsFrequency.get("pen"); //返回1

提示:

  • book[i]中只包含小写字母
  • 1 <= book.length <= 100000
  • 1 <= book[i].length <= 10
  • get函数的调用次数不会超过100000
type WordsFrequency struct {

}


func Constructor(book []string) WordsFrequency {

}


func (this *WordsFrequency) Get(word string) int {

}


/**
 * Your WordsFrequency object will be instantiated and called as such:
 * obj := Constructor(book);
 * param_1 := obj.Get(word);
 */

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