M1 Mac - VSCode using CodeRunner - Can't use auto iterator to cout vector elements

Question

Trying to run a cpp program that gives back the union of two arrays. Computer is a M1 Pro Macbook Pro 14.2 inch with Mac OS Monterey 12.6. Using VSCode with the C/C++ extensions, and Coderunner. I was having problems with running cpp programs on Vscode before as well, so I followed a bunch of different guides trying to figure it out. Some were installing mingw-w64 with homebrew, some gcc, most used coderunner, which is why I stuck with it.

#include<iostream>
#include <vector>
using namespace std;

//this code works only for sorted arrays, notice the 

void Find_Union(int arr1[],int arr2[], int n, int m)
{
  vector <int> Union;
  int i = 0, j = 0;
    while(i<n && j<m)
    {
        if(arr1[i]<=arr2[j])
        {
            if (Union.size() == 0 || Union.back() != arr1[i])
            {   
                Union.push_back(arr1[i]);
                i++;
            }
        }
        else
        {
            if (Union.size() == 0 || Union.back() != arr2[j])
            {
                Union.push_back(arr2[j]);
                j++;
            }
        }  
    }
  while (i < n) // IF any element left in arr1
  {
    if (Union.back() != arr1[i])
      Union.push_back(arr1[i]);
    i++;
  }
  while (j < m) // If any elements left in arr2
  {
    if (Union.back() != arr2[j])
      Union.push_back(arr2[j]);
    j++;
  }

    for(auto &it: Union)
    {
        cout<<it<< " ";
    }
}

int main()
{
  int arr1[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  int arr2[] = {2, 3, 4, 4, 5, 11, 12}; 
  int n = sizeof(arr1)/sizeof(arr1[0]);
  int m = sizeof(arr2)/sizeof(arr2[0]);
  Find_Union(arr1,arr2,n,m);
  return 0;
}

For some reason, when trying to run this code, I get the following error:

UnionOfTwoSortedArrays-Pointers.cpp:44:9: warning: 'auto' type specifier is a C++11 extension [-Wc++11-extensions]
    for(auto &it: Union)
        ^
UnionOfTwoSortedArrays-Pointers.cpp:44:17: warning: range-based for loop is a C++11 extension [-Wc++11-extensions]
    for(auto &it: Union)

The error is for when I'm trying to use auto iterator to print out the elements of the Union vector using cout.

I've tried to mess around with the DefaultL: Cpp Standard extension settings for the C/C++ extensions, and have also tried to edit the executor map setting for Cpp language in Code Runner's extension settings.

As a side note, using #include<bits/stdc++.h> is also gonna need some finangling I haven't gotten around to yet. Does anyone have some clear tutorial I could follow for running cpp code on VSCode on M1 Macs or some kind of fix?