擅长:python、mysql、java
<p>不需要<code>itertools</code>的<a href="https://en.wikipedia.org/wiki/One-liner_program" rel="nofollow noreferrer">one-liner</a>解决方案:</p>
<pre><code>def extendedString(a,b):
return ''.join(x+y for x,y in zip(*(s+s[-1]*(max(len(a),len(b))-len(s)) for s in (a,b))))
</code></pre>
<p>输出:</p>
^{pr2}$