#include<bits/stdc++.h>
using namespace std;
#define int long long
bool dl(int a,int b,int c)
{
    if(b*b-(4*a*c)<0)return 0;
    return 1;
}
int solve(int a,int b,int c)
{
    return (-1*b+sqrt(b*b-(4*a*c)))/(2*a);
}
signed main()
{
    int n,m;
    cin>>n>>m;
    while(n--)
    {
        int a,b,c;
        cin>>a>>b>>c;
        if(!dl(a,b,c))cout<<"NO"<<endl;
        else cout<<solve(a,b,c)<<endl;
        
    }
    return 0;
}

10pts 问如何改成满足全部特殊性质C的50pts