擅长:python、mysql、java
<p>电子邮箱:f.wue</p>
<p>所以应该是这样的:</p>
<pre><code>input_sentence = input-sequence.split("a")
if input_sentence.startswith('a') and input_sentence.endswith('a'):
print('yes')
ex = 'abbabbabbabba'
def check_recursive(character, last_characters):
sequence = character
for i in reversed(range(0,len(last_characters))):
if last_characters[i] == character:
sequence += last_characters[i]
else:
return sequence
outputs = []
for i in reversed(range(1, len(ex))):
output = check_recursive(ex[i], ex[:i])
if output != ex[i]:
outputs.append(output)
if len(set(outputs)) == 1:
print("Only one type of sequence.")
</code></pre>