bool checkRectangle(int i,bool square)
{
    int counter,length,width,diagonal;
    for(int j = 1; j < 4 ; j++)
    {
        int x1 = p[subsets[i][0]].first;
        int y1 = p[subsets[i][0]].second;
        int x2 = p[subsets[i][j]].first;
        int y2 = p[subsets[i][j]].second;
        if(j == 1)
            length = (x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
        if(j == 2)
            diagonal = (x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
        if(j == 3)
            width = (x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
    }
    for(int j = 0 ; j < 4 ; j++)
    {
        int x1 = p[subsets[i][j]].first;
        int y1 = p[subsets[i][j]].second;
        counter = 0;
        for(int k = 0 ; k < 4 ; k++)
        {
            if(j == k)continue;
            int x2 = p[subsets[i][k]].first;
            int y2 = p[subsets[i][k]].second;
            int temp = (x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
            if(temp == width)
                counter++;
            if(temp == length)
                counter++;
            if(temp == diagonal)
                counter++;
        }
        if(square)
        {
            if(counter != 5)
                return false;
        }
        else if(counter != 3)return false;
    }
    return true;
}