有了全排列,那么排列问题A(M,N)则解决了一半,直接从A中选择选择M个元素,然后对这M个元素进行全排列。其中前一步为组合(Combination),记为(M,N),感兴趣的可以自己解决。4)前一个全排列(prev_permutation)与next_permutation类似,STL也提供一个版本:
If we use PSIA with an index size of 8, the combination of superpermutation and indices would be cumsum(factorials 1 to N) * item_size + N! * index_size = 33 * 1 + 24 * 8 = 225 bytes. As you can see, the required memory more than doubled because the index type we used ...
to denote the supremum of the distinguishing advantages over all adversaries distinguishing\(f\)and\(g\). Providing access to multiple algorithms is denoted with a comma, e.g.\(\varDelta [f_1, f_2\,;\, g_1, g_2]\)denotes distinguishing the combination of\(f_1\)and\(f_2\)from ...