摘要：
1.题目描述Givenasetofcandidatenumbers(C)andatargetnumber(T),findalluniquecombinationsinCwherethecandidatenumberssumstoT.ThesamerepeatednumbermaybechosenfromCunlimitednumberoftimes.Note:Allnumbers(includingtarget)willbepositiveintegers.Elementsinacombination(a1,a2,。。。,ak)mustbeinnon-descendingorder.(ie,a 阅读全文