LeetCode 1078 Bigram分词
题目
给出第一个词 first 和第二个词 second,考虑在某些文本 text 中可能以 "first second third" 形式出现的情况,其中 second 紧随 first 出现,third 紧随 second 出现。
对于每种这样的情况,将第三个词 "third" 添加到答案中,并返回答案。
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示例 1: 输入:text = "alice is a good girl she is a good student", first = "a", second = "good" 输出:["girl","student"]
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示例 2: 输入:text = "we will we will rock you", first = "we", second = "will" 输出:["we","rock"]
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提示:
1 <= text.length <= 1000 text 由一些用空格分隔的单词组成,每个单词都由小写英文字母组成 1 <= first.length, second.length <= 10 first 和 second 由小写英文字母组成
我的代码
class Solution {
public:
vector<string> findOcurrences(string text, string first, string second) {
vector<string> words;
vector<string> res;
string word;
//将字符串读到input中
stringstream input(text);
//依次输出到result中,并存入res中
while(input>>word)
words.push_back(word);
//输出res
for(int i=0;i<words.size()-2;i++){
if(words[i] == first){
if(words[i+1] == second){
res.push_back(words[i+2]);
}
}
}
return res;
}
};
题解
使用stringstream读入字符串流,可以根据空格分割一个个读取word到words数组中,之后进行比较即可。