Contest Clarifications

15110501045 | 2016-03-26 19:39:40Author

样例中，S = \{1, 2, 3\}S={1,2,3}, 它的子集有 ∅, {1}, {2}, {3}, {1, 2}, {1, 3}, {2, 3}, {1, 2, 3}

qwn3213 | 2016-03-26 19:40:39# 1

其实毫无意义←_←

15110501045 | 2016-03-26 19:43:15# 2

不就是直接把元素异或吗0.0 关子集什么事