Мун_2020_зеркала-ход слоном

#include <iostream>
#include <cmath>
#include <vector>
#include <set>
#include <string>
#include <algorithm>
using namespace std;

void cv(vector <int> v){
    for (auto x: v) cout<<x<<' ';
    cout<<'\n';
}

struct pnt{
    int x,y;
    char mr = 'Z';
};

vector <pnt> way;

void cp(pnt x){
    //cout<<"xy= "<<x.x<<" "<<x.y<<"\n";
    //cout<<"mr= "<<x.mr<<"\n";
    cout<<x.x<<' '<<x.y<<' '<<x.mr<<"\n";
}

bool cn(pnt a, pnt b){
    return (abs(a.x-b.x) == abs(a.y - b.y));
}
bool pos = 1;

int sgn(int a, int b){
    if (a - b < 0) return -1;
    else return 1;
}

char mir(pnt fr, pnt to, pnt br){
    /*cout<<"sgn(br.x, fr.x)= "<<sgn(br.x, fr.x)<<"\n";
    cout<<"sgn(br.x, to.x)= "<<sgn(br.x, to.x)<<"\n";

    cout<<"sgn(br.y, fr.y)= "<<sgn(br.y, fr.y)<<"\n";
    cout<<"sgn(br.y, to.y)= "<<sgn(br.y, to.y)<<"\n";*/

    if (sgn(br.x, fr.x) == sgn(br.x, to.x)){
            //cout<<"return 'V';\n";
        return 'V';
    }
    else {
            //cout<<"return 'H';\n";
            return 'H';
    }
}

void brg(pnt fr, pnt to){
    if (cn(fr, to)){
          //  cout<<"cn(fr, to\n";
        return;
    }
    pnt thr;
    thr.y = to.y;
    thr.x = fr.x + (-fr.y + thr.y);

    /*cout<<"thr\n";
    cp(thr);*/
    pnt br;
    br.x = (thr.x + to.x) / 2;
    //cout<<"(thr.x + to.x) / 2 = "<<(thr.x + to.x) / 2<<"\n";
    br.y = to.y + (to.x - br.x);

    br.mr = mir(fr, to, br);
    /*cout<<"to\n";
    cp(to);
    cout<<"br\n";
    cp(br);
    cout<<"can???\n";
    cout<<"abs(br.x-to.x) "<<abs(br.x-to.x)<<"\n";
    cout<<"abs(br.y - to.y)= "<<abs(br.y - to.y)<<"\n";*/
    if (!cn(br, to) || !cn(br, fr)){
        //cout<<"CANNOT\n";
        pos = 0;
    }
    way.push_back(br);
}


int main()
{
    /*ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);*/

    pnt a,b;
    int x2,y2;
    cin>>x2>>y2;//why?
    a = {0, 0};
    b = {x2, y2};
    brg(a, b);
    //cout<<"pos= "<<pos<<"\n";
    if (!pos){
        cout<<-1<<"\n";
    }else{
        if (way.empty()){
            cout<<0<<"\n";
        }else{
            cout<<way.size()<<"\n";
            cp(way[0]);
        }
    }
}
/*
-10 -10 10 -8
0 0 5 1
0 0 -1 2
0 0 3 5
0 0 9 -1
*/