Description: ary [] {1,2,3,4} request to print all of its subsets. This is about power set】 【problems. Including the power set】 【Collection】 and 【】 【empty set. For N elements of the set (/ □ \) together, it is the power set of the number of N-th power of 2 months. Such as this example, the array has 4 elements. So with four bits of each element (assuming that 1234 bar from left to right), and 0 indicates that the number does not exist, one that exists. Then: 0000 represents the empty set {}. 0001 {4} said. 0010 that {3} 0011 for {3,4} ... ... ... ... 1110 that {1,2,3} 1111 that {1,2,3,4}.
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Subset.java
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