擅长:python、mysql、java
<p>这样的怎么样?在</p>
<pre><code>def areaCodes(n):
# if n is less than 1000, what does it mean about the number of digits?
if n < 1000:
return # fill...
# otherwise, if n is greater than 1000, how can we alter n to remove the last
# digit? (hint: there's an operation similar to division called f...r division)
return areaCodes( # operate on n somehow...)
</code></pre>