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请编写一个方法,返回某集合的所有非空子集。
给定一个int数组A和数组的大小int n,请返回A的所有非空子集。保证A的元素个数小于等于20,且元素互异。各子集的顺序为其元素p从大到小排序后按字典序从大到小,见样例。
测试样例:
[123,456,789]
返回:[[789],[456,789],[456],[123,789],[123,456,789],[123,456],[123]] ...
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Given any permutation of the numbers {0, 1, 2,..., N-1}, it is easy to
sort them in increasing order. But what if Swap(0, *) is the ONLY
operation that is allowed to use? For example, to sort {4, 0, 2, 1, 3}
we may apply the swap operations in the following way:
Swap(0, 1) => {4, 1, 2, 0, 3}
Swap(0, 3) => {4, 1, 2, 3, 0}
Swap(0, 4) => {0, 1, 2, 3, 4}
Now you are asked to find the minimum number of swaps need to sort the
given permutation of the first N nonnegative integers.
输入描述:
Each inp ...
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