rt,不知道怎么回事

是有情况没对吗

#include <bits/stdc++.h>
#define int long long
#define rep(i,a,b) for(int i=a;i<=b;i++)
#define dep(i,a,b) for(int i=a;i>=b;i--)
#define getchar() p1==p2&&(p2=(p1=buf)+fread(buf,1,1<<20,stdin),p1==p2)?EOF:*p1++
using namespace std;

static char buf[1<<20],*p1=buf,*p2=buf;
inline int read(){int x=0,f=1;char c=getchar();while(c<'0'||c>'9'){if(c=='-')f=-1;c=getchar();}while(c>='0'&&c<='9')x=(x<<3)+(x<<1)+(c^48),c=getchar();return x*f;}inline void write(int x){if(x<0)putchar('-'),x=-x;if(x>9)write(x/10);putchar(x%10+'0');}

bool memory_start;
int T, M;
int a, b, c;
bool memory_end;

int gcd(int a, int b)
{
	return (b == 0) ? a : gcd(b, a % b);
}

signed main()                                       
{
    // freopen("x.in", "r", stdin);freopen("x.out", "w", stdout);
    // printf("%.3f\n", (&memory_end - &memory_start) / 1024.0 / 1024);
    //ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> T >> M;
    while (T --)
    {
    	cin >> a >> b >> c;
    	int del = b * b - 4 * a * c;
    	if (del < 0){cout << "NO" << endl;continue;}
    	if (b == 0 && c == 0){cout << 0 << endl;continue;}
    	int f = 1, q_up = -b, q_dw = 2 * a;
    	int sq = sqrt(del);
    	if (sq * sq == del)
    	{
    		q_up += sq;
    		if (1.0 * q_up / q_dw < 0) f = -1;
    		q_up = abs(q_up), q_dw = abs(q_dw);
    		int g = gcd(q_up, q_dw);
    		q_up /= g, q_dw /= g;
    		if (f == -1) cout << "-";
    		if (q_dw == 1)
    			cout << q_up;
    		else
    			cout << q_up << "/" << q_dw;
    		putchar('\n');
    		continue;
    	}
    	if (b != 0)
    	{
    		if (1.0 * q_up / q_dw < 0) f = -1;
    		q_up = abs(q_up), q_dw = abs(q_dw);
    		int g = gcd(q_up, q_dw);
    		q_up /= g, q_dw /= g;
    		if (f == -1) cout << "-";
    		if (q_dw == 1)
    			cout << q_up << "+";
    		else
    			cout << q_up << "/" << q_dw << "+";
    	}
    	q_dw = abs(2 * a);
    	while (sq > 1)
    	{
    		if (del % (sq * sq) == 0) break;
    		sq --;
    	}
    	del = del / sq / sq;
    	int g = gcd(q_dw, sq);
    	sq /= g, q_dw /= g;
    	if (sq != 1) cout << sq << "*";
    	cout << "sqrt(" << del << ")";
    	if (q_dw != 1) cout << "/" << q_dw;
    	cout << '\n';
    }
    return 0;
}