Permutations

We can see the different permutations in a range using C++.

std::prev_permutation and std::next_permutation return the previous smaller or next bigger permutation of the newly ordered range. If a smaller or bigger permutation is not available, the algorithms return false. Both algorithms need bidirectional iterators. Per default the predefined sorting criterion std::less is used. If you use your sorting criterion, it has to obey the strict weak ordering. If not, the program is undefined.

Applies the previous permutation to the range:

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