View Code of Problem 104

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

int main() {
	int n,v1,v2;
	float t;
	while(cin >>n>>v1>>v2>>t){
		if(v1>0&&v2>0){
			if(v1<=v2){
				cout << "NO"<<endl;
			}
			else{
				if((float)n*1000.0/(v1-v2)<=t){
					cout <<fixed<<setprecision(2)<<(float)n*1000.0/(v1-v2)<<endl;
				}
				else{
					cout << "NO"<<endl;
				}
			}
		}
		else if(v1<=0&&v2>0){
			cout << "NO"<<endl;
		}
		else if(v1>0&&v2<=0){
			if((float)n*1000.0/(v1-v2)<=t){
					cout <<fixed<<setprecision(2)<<(float)n*1000.0/(v1-v2)<<endl;
				}
				else{
					cout << "NO"<<endl;
				}
		}
		else if(v1<=0&&v2<=0){
			if(v1-v2>0&&(float)n*1000.0/(v1-v2)<=t){
				cout <<(float)n*1000.0/(v1-v2)<<endl;
			}
			else{
				cout << "NO"<<endl;
			}
		}
		
	}
	return 0;
}