擅长:python、mysql、java
<p>这里有一个不使用计数器的替代解决方案</p>
<pre><code>count = dict()
#repeat for 5 classes
for i in range(0, 5):
students = input().split(", ")
#add student to count
for s in students:
if s in count:
count[s] += 1
else:
count[s] = 1
for student, occurrences in count.items():
#print if more than one occurence
if occurrences >= 2:
print(student + ":" + str(occurrences))
</code></pre>