Combination Sum II

Given a collection of candidate numbers (C) and a target number (T),
find all unique combinations in C where the candidate numbers sums to T.
Each number in C may only be used once in the combination.
All numbers (including target) will be positive integers.
Elements in a combination (a1, a2, ... , ak) must be in non-descending order.
(ie, a1 <= a2 <= ... <= ak).
The solution set must not contain duplicate combinations.
Given candidate set 10,1,2,7,6,1,5 and target 8,
A solution set is:
[1, 7]
[1, 2, 5]
[2, 6]
[1, 1, 6]

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