How to check whether a vector is a subset of another in c++

Question

I am trying to find a simple way to check whether a vector is a subset of another without sorting the order of elements in the vector. Both the vectors contain random number

Answer 1

Copy the vectors. Sort the copies. Then use std::includes on the copies.

template 
bool IsSubset(std::vector A, std::vector B)
{
    std::sort(A.begin(), A.end());
    std::sort(B.begin(), B.end());
    return std::includes(A.begin(), A.end(), B.begin(), B.end());
}