=============================================== Code mình sai chỗ nào vậy , khi test cs 7/10 đug thôi Link: oj.luyencode.net/problem/DK07 =========================================== #include<iostream> #include<cmath> #include<iomanip> int main(){ double a,b,c; std::cin >> a >> b >> c; double delta = pow(b,2) - (4*a*c); if(delta < 0 || a == 0){ std::cout << "NO"; return 0; } if(delta == 0) std::cout << std::fixed << std::setprecision(2) << (-b)/(2*a); else{ double x1, x2; x1 = (-b+sqrt(delta))/(2*a); x2 = (-b-sqrt(delta))/(2*a); if(x1 < x2){ std::cout << std::fixed << std::setprecision(2) << x1 << " " << x2; } else{ std::cout << std::fixed << std::setprecision(2) << x2 << " " << x1; } } }

#include <iostream>
#include <cmath>
#include <iomanip> 

using namespace std;

int main() {
    int a, b, c;
    cin>>a>>b>>c;
    if(a==0)
    {
        if(b==0)
        {
            if(c==0) cout<<"INF";
            else cout<<"NO";
        }
        else cout<<fixed<<setprecision(2)<<(double) -c/(double) b;
    }
    else 
    {
        int delta=b*b-4*a*c;
        if(delta<0) cout<<"NO";
        else if(delta==0) cout<<fixed<<setprecision(2)<<(double) -b/(2.0*a);
        else 
        {
            double x1=(-b+sqrt(delta))/(2.0*a);
            double x2=(-b-sqrt(delta))/(2.0*a);
            if(x1<x2) cout<<fixed<<setprecision(2)<<x1<<" "<<x2;
            else cout<<fixed<<setprecision(2)<<x2<<" "<<x1;
        }
    }
}

#include <iostream>
#include <iomanip>
#include <math.h>

using namespace std;

int a, b, c, delta = 0;

int main() {
    cin >> a >> b >> c;

    cout << fixed << setprecision(2);

    if (a == 0) {
        if (b == 0) {
            if (c != 0) cout << "NO\n";
            else cout << "INF\n";
        } else {
            cout << -c / (1.0 * b) << "\n";
        }
    } else {
        delta = b * b - 4 * a * c;

        if (delta < 0) cout << "NO\n";
        else if (delta == 0) cout << -b / (2.0 * a) << "\n";
        else cout << (-b - sqrt(delta)) / (2.0 * a) << " " << (-b + sqrt(delta)) / (2.0 * a) << "\n";
    }

    return 0;
}