是否有一些等效的库或函数为我提供一组值的下一个组合,例如next_permutation,对我来说呢?
最佳答案
组合:在Mark Nelson关于同一主题的文章中,我们有next_combination http://marknelson.us/2002/03/01/next-permutation
排列:从STL中,我们有std::next_permutation
template <typename Iterator>
inline bool next_combination(const Iterator first, Iterator k, const Iterator last)
{
if ((first == last) || (first == k) || (last == k))
return false;
Iterator itr1 = first;
Iterator itr2 = last;
++itr1;
if (last == itr1)
return false;
itr1 = last;
--itr1;
itr1 = k;
--itr2;
while (first != itr1)
{
if (*--itr1 < *itr2)
{
Iterator j = k;
while (!(*itr1 < *j)) ++j;
std::iter_swap(itr1,j);
++itr1;
++j;
itr2 = k;
std::rotate(itr1,j,last);
while (last != j)
{
++j;
++itr2;
}
std::rotate(k,itr2,last);
return true;
}
}
std::rotate(first,k,last);
return false;
}
关于c++ - powerset中的组合或子集的next_permutation,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/2685501/