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template<class RanIt>
    void sort(RanIt first, RanIt last);
template<class RanIt, class Pred>
    void sort(RanIt first, RanIt last, Pred pr);

The first template function reorders the sequence designated by iterators in the range [first, last) to form a sequence ordered byoperator<. Thus, the elements are sorted in ascending order.

The function evaluates the ordering predicate X < Y at most ceil((last - first) * log(last - first)) times.

The second template function behaves the same, except that it replaces operator<(X, Y) with pr(X, Y).