程序代码：

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

class F
{
    public:
        F(vector<int> t):_v(t){}
        bool operator()(int i,int j)
        {
            if(count(_v.begin(),_v.end(),i)!=1)
                return true;
            else
                return false;
        }
    private:
        vector<int> _v;
};
int main()
{
    vector<int> arr1{1,2,3,4,4,5,6,5,6};
    arr1.erase(unique(arr1.begin(),arr1.end(),F(arr1)),arr1.end());
    for_each(begin(arr1),end(arr1),[](int i)
    {
        cout<<i<<' ';
    });
    cout<<endl;
    return 0;
}