[P8814]解密

话不多说，上代码

#include<bits/stdc++.h>
using namespace std;
long long k,n,d,e;
int main()
{
	ios::sync_with_stdio(0);//加速
	cin.tie(0);
	cout.tie(0);
	cin>>k;
	while(k--)
	{
		cin>>n>>d>>e;
		long long m=n-d*e+2;
		long long k=m*m-4*n;
		long long k1=sqrt(k);
		if(k1*k1!=k)
		{
			cout<<"NO"<<'\n';
			continue;
		}
		if((m+k1)%2==1||m<=k1)
		{
			cout<<"NO"<<'\n';
			continue;
		}
		cout<<(m-k1)/2<<' '<<(m+k1)/2<<'\n';
	}
	return 0;//功德圆满
}