#include<iostream>
#include<cmath>
#include <stdexcept>
using namespace std;
int main(){
    double s,p,a,b,c,d;
    cin>>a>>b>>c;
    p = 0.5*(a+b+c);
    s = p*(p-a)*(p-b)*(p-c);
    d = sqrt(s);
    printf("%.1f",d);
    return 0;
}

注意区别单精度与双精度，题目的测试用例范围会很广

#include<iostream>
#include<cmath>
#include <stdexcept>
using namespace std;
int main(){
    double s,p,a,b,c,d;
    cin>>a>>b>>c;
    p = 0.5*(a+b+c);
    s = p*(p-a)*(p-b)*(p-c);
    d = sqrt(s);
    printf("%.1f",d);
    return 0;
}

#include<iostream>
#include<cmath>
#include <stdexcept>
using namespace std;
int main(){
    double s,p,a,b,c,d;
    cin>>a>>b>>c;
    p = 0.5*(a+b+c);
    s = p*(p-a)*(p-b)*(p-c);
    d = sqrt(s);
    printf("%.1f",d);
    return 0;
}

#include<bits/stdc++.h> using namespace std; int main(){ double a; cin>>a; if(a<=150)printf("%.1lf",0.4463a); if(a<=400 and a>150)printf("%.1lf",0.4663(a-150)+0.4463150); if(a>400)printf("%.1lf",0.5663(a-400)+0.4463150+0.4663250); return 0; }

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#include #include #include using namespace std; int main(){ double s,p,a,b,c,d; cin>>a>>b>>c; p = 0.5*(a+b+c); s = p*(p-a)(p-b)(p-c); d = sqrt(s); printf("%.1f",d); return 0; } 👀️ 👀️

#include<iostream>
#include<cmath>
#include <stdexcept>
using namespace std;
int main(){
    double s,p,a,b,c,d;
    cin>>a>>b>>c;
    p = 0.5*(a+b+c);
    s = p*(p-a)*(p-b)*(p-c);
    d = sqrt(s);
    printf("%.1f",d);
    return 0;
}

#include<iostream>
#include<cmath>
#include <stdexcept>
using namespace std;
int main(){
    double s,p,a,b,c,d;
    cin>>a>>b>>c;
    p = 0.5*(a+b+c);
    s = p*(p-a)*(p-b)*(p-c);
    d = sqrt(s);
    printf("%.1f",d);
    return 0;
}

#include<iostream>
#include<cmath>
#include <stdexcept>
using namespace std;
int main(){
    double s,p,a,b,c,d;
    cin>>a>>b>>c;
    p = 0.5*(a+b+c);
    s = p*(p-a)*(p-b)*(p-c);
    d = sqrt(s);
    printf("%.1f",d);
    return 0;
}

#include<iostream>
#include<cmath>
#include <stdexcept>
using namespace std;
int main(){
    double s,p,a,b,c,d;
    cin>>a>>b>>c;
    p = 0.5*(a+b+c);
    s = p*(p-a)*(p-b)*(p-c);
    d = sqrt(s);
    printf("%.1f",d);
    return 0;
}

#include<bits/stdc++.h> #include #include using namespace std; int main(){ double s,p,a,b,c,d; cin>>a>>b>>c; p = 0.5*(a+b+c); s = p*(p-a)(p-b)(p-c); d = sqrt(s); printf("%.1f",d); return 0; }

#include #include #include using namespace std; int main(){ double s,p,a,b,c,d; cin>>a>>b>>c; p = 0.5*(a+b+c); s = p*(p-a)(p-b)(p-c); d = sqrt(s); printf("%.1f",d); return 0; }