8.2

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

void odd_even(vector<int> &a,const int &lenght) {
    int left = 0;
    for (int i = 0; i < lenght; i++)
    {
        if (a[i] % 2 == 0)
        {
            swap(a[i], a[left]);
            left++;
        }
    }
}
int main()
{
vector<int> array = { 6, 9,66,785,632,569,56,654,2,0, 31,23,33};
odd_even(array, array.size());
for(int i=0;i<array.size();i++)
cout<<array[i]<< " ";
}