擅长:python、mysql、java
<p>您也可以使用<a href="http://docs.python.org/2/library/collections.html#collections.OrderedDict" rel="nofollow">^{<cd1>}</a>并在此处设置差异:</p>
<pre><code>>>> from collections import OrderedDict
>>> dic1 = OrderedDict((k[0],k) for k in A)
>>> [dic1[x] for x in set(dic1) - set(y[0] for y in B)]
[['3', '2']]
</code></pre>
<p>总体复杂性将是<code>O(max(len(A), len(B)))</code></p>
<p>如果顺序无关紧要,那么正常的口述就足够了。在</p>