LeetCode 1078 Bigram分词

class Solution:
    def findOcurrences(self, text: str, first: str, second: str) -> List[str]:
        res = []
        list_items = text.split(' ')
        for i in range(len(list_items)-2):
            if list_items[i] == first and list_items[i+1] == second:
                res.append(list_items[i+2])
        return res