float mat::det(const mat & b)const
{
float rez = 0;
if (b.dim == 2) {
rez += det2x(b);
}else{
for (int i = 0; i < b.dim; i++) {
mat aux = b.getMat(i);
if ((i + 1) % 2 == 0) {
rez += +b.m[0][i] * det(aux);
}
else {
rez -= +b.m[0][i] * det(aux);
}
}
}
return rez;
}
