牛客多校第一场 Random Point in Triangle

https://ac.nowcoder.com/acm/contest/881/F

打表代码：

#include<bits/stdc++.h>
using namespace std;
double x[]= {,,},y[]= {,,};
double a,b;
double area(double x1,double y1,double x2,double y2,double x3,double y3)
{
    return fabs(x1*y2+x2*y3+x3*y1-x1*y3-x2*y1-x3*y2);
}
double cal()
{
    double t=area(a,b,x[],y[],x[],y[]);
    t=max(t,area(a,b,x[],y[],x[],y[]));
    t=max(t,area(a,b,x[],y[],x[],y[]));
    return t;
}
int main()
{
    //double a,b;
    int R=;
    while(R--)
    {
        srand(time(NULL));
        double ans=,t;
        int f=;
        for(int i=; i<=; i++)
        {
            f=rand()%;
            a=rand()%/1001.0;
            b=rand()%/1001.0;
            t=a+b;
            if(t>){
                a=a/t;
                b=b/t;
            }
            //cout<<a<<b<<'\n';
             ans+=cal();
        }
        cout<<*ans/<<'\n';
    }

}

AC代码：

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll x[],y[];

int main()
{
    while(scanf("%lld%lld%lld%lld%lld%lld",&x[],&y[],&x[],&y[],&x[],&y[])!=EOF){
        ll s=abs(x[]*y[]+x[]*y[]+x[]*y[]-x[]*y[]-x[]*y[]-x[]*y[]);
      //  cout<<s<<endl;
        cout<<*s<<'\n';
    }
}