cpp/algorithm/ranges/includes

@1@ Returns if the projections of the sorted range  is a  of the projections of the sorted range. @2@ Same as, but uses and  as the source ranges, as if by using  and  as  and  respectively, and  and  as  and  respectively.

Both ranges must be sorted with the given comparison function. A subsequence need not be contiguous.

Return value
if is a subsequence of ; otherwise.

Complexity
At most comparisons, where  is  and  is.