2017. G(RGB) OK

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


int r,g,b =0;
vector <string> colors;
int red = 0;
int green =0;
int blue = 0;

int broiCvetove = 0;

string rgb2hex(int r, int g, int b, bool with_head = false);

string rgb2hex(int r, int g, int b, bool with_head)
{
    stringstream ss;
    if (with_head)
        ss << "#";
    ss << hex << (r << 16 | g << 8 | b);
    return ss.str();
}

void HexToRGB(string inputString) // input example: #ff00ff
{
    //cout << "hextorgb inputString: " << inputString << endl;
    inputString.erase(0,1); // removing the hashtag
    int num = stoi(inputString,0,16);
    int RGB = num;
    r = RGB >> 16;
    g = (RGB & 0x00ff00) >> 8;

    b = (RGB & 0x0000ff);

    RGB = 0;
    RGB |= r <<16;
    RGB |= b <<8;
    RGB |= g;
   // cout << "red: " << r <<endl;


}

void currentAverageColor()
{

    int redSum = 0;
    int greenSum =0;
    int blueSum =0;
    for(int i =0; i<broiCvetove; i++)
    {
        string currentString  = colors[i];
        HexToRGB(currentString);
        redSum = redSum + r;
        greenSum = greenSum + g;
        blueSum = blueSum + b;
    //    cout << "red sum : " << redSum << endl;

    }
    red = redSum/broiCvetove;
  //  cout << "red: " << endl;
    green = greenSum/broiCvetove;
    blue = blueSum/broiCvetove;
  //  cout << "red: " << red << "green " << green<< "blue: " << blue<<  endl;



}




int main()

{


int broiTestove =0;
cin >> broiTestove;
cin.ignore();



string input, newString;


 while(broiTestove--)
    {
    cin >> broiCvetove;
    cin.ignore();
    getline(cin, input);
    stringstream stream;
    stream.str(input);
    while(stream >> newString)
    {
        colors.push_back(newString);
    }
    for(int i =0; i<colors.size();i++)
    {

       // cout << colors[i] << endl;
    }
    currentAverageColor();
    auto result = rgb2hex(red,green, blue);
    //cout << "hex: " << result << endl;
    cout << '#' <<result << endl;
    colors.clear();
    }








}