>>432
int solve(double a, double b, double c)
{
double d = b * b - 4 * a * c;

if(d<0) return 0;

answer1 = (-b + sqrt(d)) / 2 / a;
answer2 = (-b - sqrt(d)) / 2 / a;

return d == 0 ? 1 : 2;
}