#139

Word Break

Medium
ArrayHash SetStringDPTrieMemoization

Given a string `s` and a dictionary of strings `wordDict`, return `true` if `s` can be segmented into a space-separated sequence of one or more dictionary words.

**Note** that the same word in the dictionary may be reused multiple times in the segmentation.

Examples

Example 1
Input: s = "leetcode", wordDict = ["leet","code"]
Output: true
Return true because "leetcode" can be segmented as "leet code".
Example 2
Input: s = "applepenapple", wordDict = ["apple","pen"]
Output: true
Return true because "applepenapple" can be segmented as "apple pen apple". Note that you are allowed to reuse a dictionary word.
Example 3
Input: s = "catsandog", wordDict = ["cats","dog","sand","and","cat"]
Output: false

Constraints

  • •1 <= s.length <= 300
  • •1 <= wordDict.length <= 1000
  • •1 <= wordDict[i].length <= 20
  • •s and wordDict[i] consist of only lowercase English letters.
  • •All the strings of wordDict are unique.
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