class Solution:
def strStr(self, haystack: str, needle: str) -> int:
# 判斷needle是否為NOne或者為空字串
if not needle or len(needle) == 0:
return 0
# 定義兩個變數，用來接收needle的長度
length,index = len(needle),0
# 進行回圈，當index的值
while index <= len(haystack) - length:
# 判斷是否可以匹配
if haystack[index : index + length] == needle:
return index
# 索引加一
else:
index += 1
# 代表匹配失敗，回傳-1
return -1
A = Solution()
print(A.strStr("hello","ll"))
print(A.strStr("helll","hahah"))
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