####永久珍藏这个程序
这个程序对我有非常的意义，大仙在某一天突然发来这个需求。在某项业务的Excel中有90个数， 他精心挑选了若干个数，并记录了这些数的和，但是Excel文件崩溃导致他不知道最终选择了哪些数， 只记住了这个和是多少，十万火急让我想办法来解决一下。我一看这典型的组合问题，遍历子数组
不过90个数的全组合是90！,大大超出了计算能力，依据他选择数时候的一些线索，做了精细的剪枝工作， 最后居然奇迹般的找出来了！
编程的力量真是强大！
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