template<class BidirectionalIterator> bool next_permutation(BidirectionalIterator first, BidirectionalIterator last); template<class BidirectionalIterator, class Compare> bool next_permutation(BidirectionalIterator first, BidirectionalIterator last, Compare comp);
Effects: Takes a sequence defined by the range [first,last) and transforms it into the next permutation. The next permutation is found by assuming that the set of all permutations is lexicographically sorted with respect to operator< or comp. If such a permutation exists, it returns true. Otherwise, it transforms the sequence into the smallest permutation, that is, the ascendingly sorted one, and returns false.
Complexity: At most (last - first)/2 swaps.
template<class BidirectionalIterator> bool prev_permutation(BidirectionalIterator first, BidirectionalIterator last); template<class BidirectionalIterator, class Compare> bool prev_permutation(BidirectionalIterator first, BidirectionalIterator last, Compare comp);
Effects: Takes a sequence defined by the range [first,last) and transforms it into the previous permutation. The previous permutation is found by assuming that the set of all permutations is lexicographically sorted with respect to operator< or comp.
Returns: true if such a permutation exists. Otherwise, it transforms the sequence into the largest permutation, that is, the descendingly sorted one, and returns false.
Complexity: At most (last - first)/2 swaps.
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