Help me in solving NFS problem

help
, ,
1

My issue

for input {1 589 1 1}

it gives me output “yes” with this code:

if(u==v)
std::cout << “yes” << std::endl;
else{
float v1 = sqrt((uu) - (2a*s));

    if(v<v1)
    std::cout << "no" << std::endl;
    else
    std::cout << "yes" << std::endl;

}
}

but “no” if I do this:

if(u==v)
std::cout << “yes” << std::endl;
else{
float v1 = sqrt((uu) - (2a*s));

    if(v1<v)
    std::cout << "yes" << std::endl;
    else
    std::cout << "no" << std::endl;

}
}

I think both should give same output because they are mostly same except of “if” conditions. I am a beginner and I can’t understand what is the difference

My code

#include <iostream>
#include <cmath>
using namespace std;

void soln(){
    float u,v,a,s;
    std::cin >> u>>v>>a>>s;
    
    if(u==v)
    std::cout << "yes" << std::endl;
 else{
       float v1 = sqrt((u*u) - (2*a*s));
        
        if(v<v1)
        std::cout << "no" << std::endl;
        else
        std::cout << "yes" << std::endl;
    
}
}

int main() {
	// your code goes here
	int t;
	std::cin >> t;
	while(t--){
	    soln();
	}
	return 0;
}

Learning course: Level up from 1* to 2*
Problem Link: CodeChef: Practical coding for everyone