擅长:python、mysql、java
<p><strong>如果顺序不重要</strong></p>
<pre><code>from collections import defaultdict
dd = defaultdict(int)
for x, y, z in A:
dd[(x,y)] += z
res = [k + (v,) for k, v in dd.iteritems()]
# [(1, 5, 0), (6, 8, 0), (2, 2, 2)]
</code></pre>
<p><strong></p>
^{pr2}$