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1.题目要求:

2.题目实列:

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

3.做题步骤:
巧妙运用map容器求次数
4.题目代码:

class WordsFrequency {
public://使用map容器，把每个单词的频率统计出来map<string,int> word_count;WordsFrequency(vector<string>& book) {for(int i = 0;i < book.size();i++){map<string,int> :: iterator it = word_count.find(book[i]);if(it != word_count.end()){it->second += 1;}else{word_count.insert(make_pair(book[i],1));}}}int get(string word) {//返回单词频率map<string,int> :: iterator it = word_count.find(word);if(it != word_count.end()){return it->second;}else{return 0;}}
};/*** Your WordsFrequency object will be instantiated and called as such:* WordsFrequency* obj = new WordsFrequency(book);* int param_1 = obj->get(word);*/