擅长:python、mysql、java
<p>使用集合如何:</p>
<pre><code>voteListString = ['2314', '4432', '4312', '1243', '1234', '2431']
spoiltBallots = 0
validVoteList = []
for v in voteListString:
s = set(v)
if (len(s)<4):
spoiltBallots += 1
else:
validVoteList.append(v)
</code></pre>