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#include?

#include??//0->o

#include?

#include?

using?namespace?std;

template?

bool?next_combination(BidirectionalIterator?first,?BidirectionalIterator?middle,?BidirectionalIterator?last)

{

&nbsp&nbsp&nbsp?if?(first?==?middle?||?middle?==?last)?return?false;

&nbsp&nbsp&nbsp?BidirectionalIterator?i?=?middle,?j?=?std::upper_bound(middle,?last,?*--i);

&nbsp&nbsp&nbsp?if?(j?!=?last)

&nbsp&nbsp&nbsp?{

&nbsp&nbsp&nbsp?&nbsp&nbsp&nbsp?std::iter_swap(i,?j);

&nbsp&nbsp&nbsp?&nbsp&nbsp&nbsp?return?true;

&nbsp&nbsp&nbsp?}

&nbsp&nbsp&nbsp?i?=?std::lower_bound(first,?middle,?*--j);

&nbsp&nbsp&nbsp?if?(i?==?first)

&nbsp&nbsp&nbsp?{

&nbsp&nbsp&nbsp?&nbsp&nbsp&nbsp?std::rotate(first,?middle,?last);

&nbsp&nbsp&nbsp?&nbsp&nbsp&nbsp?return?false;

&nbsp&nbsp&nbsp?}

&nbsp&nbsp&nbsp?BidirectionalIterator?ii?=?i,?jj?=?last;

&nbsp&nbsp&nbsp?j?=?std::upper_bound(middle,?last,?*--i);

&nbsp&nbsp&nbsp?std::advance(jj,?-std::distance(middle,?j)-1);

&nbsp&nbsp&nbsp?std::rotate(ii,?j,?last);

&nbsp&nbsp&nbsp?std::rotate(i,?ii,?last);

&nbsp&nbsp&nbsp?std::rotate(middle,?jj,?last);

&nbsp&nbsp&nbsp?return?true;

}

int?main()

{

&nbsp&nbsp&nbsp?int?a[10];

&nbsp&nbsp&nbsp?for?(int?i?=?0;?i?

&nbsp&nbsp&nbsp?&nbsp&nbsp&nbsp?a[i]?=?i;

&nbsp&nbsp&nbsp?do?copy(a,?a+6,?ostream_iterator(cout,?"?")),?cout?<

&nbsp&nbsp&nbsp?while?(next_combination(a,?a+6,?a+10));

}

總結

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