Word Pattern
Given a pattern and a string s , find if s 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 s . Example 1: Input: pattern = "abba", s = "dog cat cat dog" Output: true Example 2: Input: pattern = "abba", s = "dog cat cat fish" Output: false Example 3: Input: pattern = "aaaa", s = "dog cat cat dog" Output: false Example 4: Input: pattern = "abba", s = "dog dog dog dog" Output: false Constraints: 1 <= pattern.length <= 300 pattern contains only lower-case English letters. 1 <= s.length <= 3000 s contains only lower-case English letters and spaces ' ' . s does not contain any leading or trailing spaces. All the words in s are separated by a single space . class Solution { public boolean wordPattern(String pattern, String s) { H