lasery i przepinanie wskaźników

#include <bits/stdc++.h>
#include <map>

using namespace std;

int max_v = 1;
int v = 1;

struct booster{
    int x;
    int y;
    char c;
    booster *l;
    booster *r;
    booster *u;
    booster *d;
    int OFF;
    booster(int x = 0, int y = 0, char c = 0){
        this->x = x;
        this->y = y;
        this->c = c;
        this->l = NULL;
        this->r = NULL;
        this->u = NULL;
        this->d = NULL;
        OFF = -1;
    }
};

bool comp_x(const booster &a,const booster &b){
    return (a.x < b.x || (a.x == b.x && a.y < b.y));
}

bool comp_y(const booster &a,const booster &b){
    return (a.y < b.y || (a.y == b.y && a.x < b.x));
}

int main(){
    int n;
    scanf("%d", &n);
    vector<booster> tab;
    vector<bool> vis(n);

    // # CZYTANIE #
    for(int i=0; i<n; i++){
        int a, b;
        char c;
        scanf("%d %d %c", &a, &b, &c);
        tab[i] = booster(a, b, c);
    }



    int s = tab.size();




    sort(tab.begin(), tab.end(), comp_x); // ustawia UP/DOWN po przekątnej od LU do RD


    if(tab[0].x == tab[1].x && tab[0].y < tab[1].y)
        tab[0].d = &tab[1];
    if(tab[s-1].x == tab[s-2].x && tab[s-1].y > tab[s-2].y)
        tab[s-1].u = &tab[s-2];

    for(int i = 1 ; i<s-1; i++){
        if(tab[i-1].x == tab[i].x) tab[i].u = &tab[i-1];
        if(tab[i+1].x == tab[i].x) tab[i].d = &tab[i+1];
    }








    sort(tab.begin(), tab.end(), comp_y); // ustawia LEFT/RIGHT tak samo

    if(tab[0].y == tab[1].y && tab[0].x < tab[1].x)
        tab[0].r = &tab[1];
    if(tab[s-1].y == tab[s-2].y && tab[s-1].x > tab[s-2].x)
        tab[s-1].l = &tab[s-2];

    for(int i = 1 ; i<tab.size()-1; i++){
        if(tab[i-1].y == tab[i].y) tab[i].l = &tab[i-1];
        if(tab[i+1].y == tab[i].y) tab[i].r = &tab[i+1];
    }








    for(int i=0; i<s; i++){
        v = 1;
        booster *next= &tab[i];
        next->OFF = i; //oznacza włączony
        while(next != NULL){

            next->OFF = i;


            if (next->c == '^'){
                booster *tmp = next->u;
                while(tmp->OFF == i)
                    tmp = tmp->u;
                next = tmp;
            }



            else if(next->c == '<' ){
                booster *tmp = next->l;
                while(tmp->OFF == i)
                    tmp = tmp->l;
                next = tmp;
            }



            else if(next->c == 'v'){
                booster *tmp = next->d;
                while(tmp->OFF == i)
                    tmp = tmp->d;
                next = tmp;
            }



            else if(next->c == '>'){
                booster *tmp = next->r;
                while(tmp->OFF == i)
                    tmp = tmp->r;
                next = tmp;
            }

            v++;
        }
        if(v > max_v) max_v = v;
    }




    printf("%d", max_v);
    return 0;
}