30分，求助

#include <bits/stdc++.h>
using namespace std;
double a,b,c;
int n,m;
double drt,xx1,xx2,xm,xa;
void fs(int up,int down);
void gh(int b,int a2,int d,int f);
int main()
{
    cin>>n>>m;
    for(int i=1; i<=n; i++)
    {
        cin>>a>>b>>c;
        drt=b*b*1.0-4.0*a*c;

        if(drt>=0)
        {
            xx1=(b-b*2.0)+sqrt(drt);
            xx2=(b-b*2.0)-sqrt(drt);
            xm=max(xx1/(a*2.0),xx2/(a*2.0));
            if(xm==int(xm)) cout<<int(xm)<<endl;
            else if(xx1 == int(xx1) || xx2==int(xx2))
            {
                if(xm==xx1/(a*2.0)) fs(xx1,2*a);
                else fs(xx2,2*a);
                cout<<endl;
            }
            else
            {
                if(xx1*1.0/(a*2.0)>=xx2*1.0/(a*2.0)) gh(b-b*2,a*2,drt,1);
                else gh(b-b*2,a*2,drt,2);
                cout<<endl;
            }
        }
        else cout<<"NO";
    }
    return 0;
}

void fs(int up,int down)
{
    if(up==0) cout<<'0';
    else
    {
        int gcd=abs(__gcd(up,down));
        if(down==1) cout<<up;
        else if(down==-1)
        {
            if(up>0) cout<<'-'<<up;
            else cout<<abs(up);
        }
        else if(up%down==0) cout<<up/down;
        else if(down<0 && up>0 || down>0 && up<0)
        {
            cout<<'-';
            cout<<abs(up)/gcd<<'/'<<abs(down)/gcd;
        }
        else cout<<abs(up)/gcd<<'/'<<abs(down)/gcd;
    }
    return;
}

void gh(int b,int a2,int d,int f)
{
    if(b!=0)  fs(b,a2);
    int xx1=1,xx2=0;
    bool flag=0;
    for(int i=2; i<=d; i++)
    {
        if(d%i==0)
        {
            if(sqrt(d*1.0/i) == int(sqrt(d*1.0/i)) )
            {
                xx1=sqrt(d/i);
                xx2=i;
                flag=1;
                break;
            }
        }
    }
    if(xx1==0 || xx2==0)
    {
        xx2=d;
        xx1=1;
    }
    if(f==1)
    {
        if(a2<0) cout<<'-';
        else if(b!=0) cout<<'+';
    }
    else if(f==2)
    {
        if(a2<0 && b!=0) cout<<'+';
        else cout<<'-';
    }
    if(xx1%a2==0)
    {
        if(abs(xx1/a2)!=1) cout<<abs(xx1)/abs(a2)<<'*';
        printf("sqrt(%d)",xx2);
    }
    else if( a2%xx1==0) printf("sqrt(%d)/%d",xx2,abs(a2)/abs(xx1));
    else
    {
        cout<<abs(xx1)<<'*';
        printf("sqrt(%d)/%d",xx2,abs(a2));
    }
    return;
}