290. Word Pattern
https://leetcode.com/problems/word-pattern/
Given a pattern and a string str, find if str follows the same pattern.
Here follow means a full match, such that there is a bijection between a letter in pattern and a non-empty word in str.
Example 1:
Input: pattern ="abba", str ="dog cat cat dog"Output: true
Example 2:
Input:pattern ="abba", str ="dog cat cat fish"Output: false
Example 3:
Input: pattern ="aaaa", str ="dog cat cat dog"Output: false
Example 4:
Input: pattern ="abba", str ="dog dog dog dog"Output: false
Notes:
You may assume pattern contains only lowercase letters, and str contains lowercase letters that may be separated by a single space.
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