擅长:python、mysql、java
<p>与其手动求和频率,不如使用<a href="http://docs.python.org/library/collections.html#collections.counter" rel="noreferrer">^{<cd1>}</a>和<a href="http://docs.python.org/library/itertools.html" rel="noreferrer">^{<cd2>}</a>:</p>
<pre><code>from collections import Counter
from itertools import chain, combinations
meets = Counter(chain.from_iterable(combinations(line, 2) for line in lines))
</code></pre>
<p>其中<code>lines</code>是名称的iterable。在</p>