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1961. 检查字符串是否为数组前缀

给你一个字符串 s 和一个字符串数组 words ,请你判断 s 是否为 words前缀字符串

字符串 s 要成为 words前缀字符串 ,需要满足:s 可以由 words 中的前 kk正数 )个字符串按顺序相连得到,且 k 不超过 words.length

如果 swords前缀字符串 ,返回 true ;否则,返回 false

示例 1:

输入: s = "iloveleetcode", words = ["i","love","leetcode","apples"]
输出: true
解释:
s 可以由 "i"、"love" 和 "leetcode" 相连得到。

示例 2:

输入: s = "iloveleetcode", words = ["apples","i","love","leetcode"]
输出: false
解释:
数组的前缀相连无法得到 s 。

提示:

  • 1 <= words.length <= 100
  • 1 <= words[i].length <= 20
  • 1 <= s.length <= 1000
  • words[i]s 仅由小写英文字母组成

题解 (Python)

1. 题解

class Solution:
    def isPrefixString(self, s: str, words: List[str]) -> bool:
        if s == "":
            return True
        elif words == []:
            return False
        elif len(s) < len(words[0]):
            return False
        elif s[:len(words[0])] != words[0]:
            return False
        else:
            return self.isPrefixString(s[len(words[0]):], words[1:])