Update 06.11.md

result_temp is not used.

I have tested the code in this chapter. They works fine in general case. But I haven't tested it with corner case. In general, it is fine for the example.
add problem: K Smallest Sums (UVa 11997)
Merge pull request #277 from klb3713/master

add problem: K Smallest Sums (UVa 11997)
Merge pull request #275 from alvas/patch-1

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