题解 - 苏州市吴江区中学生信息编程竞赛域

4
12239姚与露 (12239姚与露) LV 7 @ 2021-11-15 09:38:38

#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
int a,b,c;
double p,s;
cin>>a>>b>>c;
if(a+b>c&&a+c>b&&b+c>a)
{
p=(a+b+c)/2;
s=sqrt(p*(p-a)*(p-b)*(p-c));
cout<<fixed<<setprecision(2)<<s<<endl;
}
else
cout<<"NO"<<endl;

return 0;
}
0
ta42滕迅 (ta42滕迅) LV 6 @ 2022-07-01 14:42:15

#include<bits/stdc++.h>
using namespace std;
int main( )
{
double a,b,c;
cin >> a >> b >> c;
if(a + b > c && a + c > b && b + c > a)
if(a - b < c && a - c < b && b - c < a)
{
double p = (a + b + c) / 2;
double s = sqrt(p * (p - a) * (p - b) * (p - c));
printf("%.2f",s);
}
else
printf("NO");
else
printf("NO");
return 0;
//题目打错了，应为 s = √ p(p - a)(p - b)(p - c)
}
-1
12337陈子函 (12337陈子函) LV 8 @ 2021-11-03 20:22:19

#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
int a,b,c;double p;
cin>>a>>b>>c;p=(a+b+c)/2.0;
if(a+b>c&&a+c>b&&c+b>a)
cout<<fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
else
cout<<"NO"<<endl;
return 0;
}
-2
12234洪子昊 (12234洪子昊) LV 8 @ 2021-11-08 21:42:53

#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
double p,a,b,c;
cin>>a>>b>>c;p=(a+b+c)/2.0;
if(a+b>c&&b+c>a&&c+a>b)
cout<<fixed<<setprecision(2)<<sqrt(p*(p-a)*(p-b)*(p-c));
else
cout<<"NO";
return 0;
}