Given a string s and a set of words wordDict, return true if s can be segmented into a space-separated sequence of one or more dictionary words. The same dictionary word may be reused multiple times. An empty string is considered segmentable.
Example 1:
Input: s = 'leetcode', wordDict = {leet, code}
Output: true
Explanation: leetcode splits into leet and code, both of which are in the dictionary.
Example 2:
Input: s = 'applepenapple', wordDict = {apple, pen}
Output: true
Explanation: apple + pen + apple. The word apple is reused.
Example 3:
Input: s = 'catsandog', wordDict = {cats, dog, sand, and, cat}
Output: false
Explanation: No valid segmentation exists for catsandog using the given dictionary.
Example 4:
Input: s = 'apple', wordDict = {apple}
Output: true
Explanation: apple matches a single dictionary word exactly.
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