word_pattern.py

"""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.

Examples:
pattern = "abba", str = "dog cat cat dog" should return true.
pattern = "abba", str = "dog cat cat fish" should return false.
pattern = "aaaa", str = "dog cat cat dog" should return false.
pattern = "abba", str = "dog dog dog dog" should return false.
"""


class Solution:
    def wordPattern(self, pattern, str):
        """
        :type pattern: str
        :type str: str
        :rtype: bool
        """
        arr = str.split(" ")
        if len(arr) != len(pattern):
            return False
        check = {pattern[0]: arr[0]}
        for i in range(1, len(str)):
            if pattern[i] == pattern[i-1]:
                pass