[LeetCode]#2124. Check if All A’s Appears Before All B’s

Input: s = "aaabbb"
Output: true
Explanation:
The 'a's are at indices 0, 1, and 2, while the 'b's are at indices 3, 4, and 5.
Hence, every 'a' appears before every 'b' and we return true.
  1. check pattern “ba” is matched with s.
  2. If yes, return False. Else, return True.
class Solution:
def checkString(self, s):
if "ba" in s:
return False
else:
return True

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