LeetCode.139 单词拆分

class Solution:
    def wordBreak(self, s: str, wordDict: List[str]) -> bool:
        dp = [0] * (len(s)+1)
        dp[0] = 1
        for start in range(len(dp)):
            for end in range(start+1, len(dp)):
                if dp[start] and s[start:end] in wordDict:
                    dp[end] = 1
        return bool(dp[-1])