typedef struct teajub {
  int n;
  double sx, sx2, sx3, sx4;
  double sy, syx, syx2;
  double a, b, c;
  } * tajub ;

void nuevodAjusteParab (tajub * najub);

void acerosdAjusteParab (tajub ajub);

void borradAjusteParab (tajub ajub);

void imprimedAjusteParab (tajub ajub);

void anyadedAAjusteParab (tajub ajub, int x, int y);

void calculaAjusteParab (tajub ajub);

double distanciaAParab (tajub ajub, int x, int y);