Description: Have a magic pocket, the total volume is 40, this pocket can conjure up some of the items, the total volume of these items must be 40. John now want to get the n-th items, the volume of each article are a1, a2, ... an. John can be selected from these items, and if the total volume of the selected object is 40, then the use of this magical pocket, John can obtain these items. The question now is, John has a number of different choice items.
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Magic_pocket.java
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