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140. 单词拆分 II

题目描述

给定一个字符串 s 和一个字符串字典 wordDict ,在字符串 s 中增加空格来构建一个句子,使得句子中所有的单词都在词典中。以任意顺序 返回所有这些可能的句子。

注意:词典中的同一个单词可能在分段中被重复使用多次。

 

示例 1:

输入:s = "catsanddog", wordDict = ["cat","cats","and","sand","dog"]
输出:["cats and dog","cat sand dog"]

示例 2:

输入:s = "pineapplepenapple", wordDict = ["apple","pen","applepen","pine","pineapple"]
输出:["pine apple pen apple","pineapple pen apple","pine applepen apple"]
解释: 注意你可以重复使用字典中的单词。

示例 3:

输入:s = "catsandog", wordDict = ["cats","dog","sand","and","cat"]
输出:[]

 

提示:

  • 1 <= s.length <= 20
  • 1 <= wordDict.length <= 1000
  • 1 <= wordDict[i].length <= 10
  • s 和 wordDict[i] 仅有小写英文字母组成
  • wordDict 中所有字符串都 不同

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