C++ & 引用
http://www.cnblogs.com/Mr-xu/archive/2012/08/07/2626973.html
LEEDcode算法
http://cache.baiducontent.com/c?m=9d78d513d9d431a84f9be2697d1dc011124381132ba6d5020bd58438e5732c41506793ac51270772d2d27d1716df384b99842173471450c48cb9fe5ddccb8559589f5647676df75665d30de88b182a9b66d618feae6afaa7a06ccefbc5d3a805129c0f127af7acdc1c1d569d38b04a66a2e7c91648024fa7be7023a408297e827517f014a2be7373068af1d75c49c129&p=83759a46d6c650e00cfece2d0214c9&newp=81769a478e9d06f110bd9b7d0d13c4231610db2151d4d6106b82c825d7331b001c3bbfb423241600d6c27a610aab425aecf23573360021a3dda5c91d9fb4c57479d079732e54&user=baidu&fm=sc&query=%B5%DD%B9%E9%C7%F3%BD%E2%D7%D3%BC%AF%BA%CD%CE%CA%CC%E2&qid=a98441eb00012af3&p1=2
Leedcode官网
https://leetcode.com/problemset/algorithms/?search=subset