How to compare vector with array?

Question

I would like to compare vector with an array. Elements in vector and in array are in different order, unsorted and can duplicated. E.g.

Below are the same:

vector<int> lvector = {5,7,3,1,2,7};
int larray[6] = {3,5,1,7,2,7}

Below, not the same:

vector<int> lvector = {5,7,3,1,2,7,5};
int larray[7] = {3,5,1,7,2,7,3}

And something like this is also not the same:

vector<int> lvector = {1,1,1,1,2,2};
int larray[6] = {1,1,1,1,1,2}

Now I need to check if vector and array have got the same elements. I can't modify the vector and the array, but I can create a new container and copy the element from vector and array to this new container and then copare them. I am asking about this, because I would like to do this in en efficient way. Thanks.

Answer 1

That's a variant of what proposed by soon:

#include <iostream>
#include <unordered_set>
#include <vector>


int main()
{
    std::vector<int> v{5, 7, 3, 1, 2, 7};
    int arr[] = {3, 5, 1, 7, 2, 7};

    std::vector<int> mv(std::begin(v), std::end(v));
    std::vector<int> ma(std::begin(arr), std::end(arr));
    std::sort(mv.begin(), mv.end()) ;
    std::sort(ma.begin(), ma.end()) ;

    std::cout << "Are equal? " << (mv == ma) << std::endl;
    return 0;
}