28 如何获得集合的所有子集?(电源组) 给定一套 {0, 1, 2, 3} 如何产生子集: [set(), {0}, {1}, {2}, {3}, {0, 1}, {0, 2}, {0, 3}, {1, 2}, {1, 3}, {2, 3}, {0, 1, 2}, {0, 1, 3}, {0, 2, 3}, {1, 2, 3}, {0, 1, 2, 3}] 103 python set powerset
26 在Java中获取集合的幂集 的幂集{1, 2, 3}是: {{}, {2}, {3}, {2, 3}, {1, 2}, {1, 3}, {1, 2, 3}, {1}} 假设我有一个SetJava语言: Set<Integer> mySet = new HashSet<Integer>(); mySet.add(1); mySet.add(2); mySet.add(3); Set<Set<Integer>> powerSet = getPowerset(mySet); 如何编写具有最佳可能复杂度的函数getPowerset?(我认为可能是O(2 ^ n)。) 86 java algorithm set powerset