cspJ T3 10分？？？

#include<bits/stdc++.h>
using namespace std;
int t,m;
signed main()
{
//	freopen("uqe.in","r",stdin);
//	freopen("uqe.out","w",stdout);
	cin>>t>>m;
	while(t--){
		long long a,b,c;
		cin>>a>>b>>c;
		long long delta=((-4)*a*c)+b*b;
		if(delta<0) cout<<"No"<<endl;
		else{
			bool flag=0;			
			long long cnt=0,sqrtd=sqrt(delta);
			long long ans=max((-sqrtd-b),(sqrtd-b))/(2*a);
			cout<<ans<<endl;
		}
	}
	return 0;
}