sgu 162 分类： sgu 2015-04-25 13:27 39人阅读 评论(0) 收藏

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似乎没有什么好说的。。。

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#include<map>
#include<queue>
#include<stack>
#include<utility>
#include<string>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<cmath>
#include<iostream>
#include<algorithm>
#define pow2(x) ((x)*(x))

double a,b,c,d,e,f;
double D,E,F,ans;

int main()
{
#ifndef ONLINE_JUDGE
    freopen("sgu162.in","r",stdin);
    freopen("sgu162.out","w",stdout);
#endif

    std::cin >> a >> b >> c >> f >> e >> d;

    D = pow2(b)+pow2(c)-pow2(d);
    E = pow2(a)+pow2(c)-pow2(e);
    F = pow2(a)+pow2(b)-pow2(f);

    ans = sqrt((long double)4*pow2(a)*pow2(b)*pow2(c)-pow2(a)*pow2(D)-pow2(b)*pow2(E)-pow2(c)*pow2(F)+D*E*F)/12;

    printf("%.4lf\n",ans);//std::cout << ans;

#ifndef ONLINE_JUDGE
    fclose(stdin);
    fclose(stdout);
#endif
    return 0;           
}

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