Codeforces Round #140 (Div. 2)

A. Where do I Turn?

#include <iostream>

using namespace std;
struct point
{
    long long x,y;
}p[3];
long long chaji(point a,point b,point c)
{
    return (c.x-a.x)*(b.y-a.y)-(b.x-a.x)*(c.y-a.y);
}
int main()
{
    int i;
    for(i=0;i<3;i++) cin>>p[i].x>>p[i].y;
    if((p[2].y-p[1].y)*(p[1].x-p[0].x)==(p[1].y-p[0].y)*(p[2].x-p[1].x))
        cout<<"TOWARDS"<<endl;
    else if(chaji(p[2],p[1],p[0])>0)
        cout<<"LEFT"<<endl;
    else
        cout<<"RIGHT"<<endl;
    return 0;
}

B. Effective Approach

#include <iostream>

using namespace std;

int main()
{
    long long n,m,x,i,ans1,ans2;
    int data[100005],inp[100005];
    cin>>n;
    for(i=1;i<=n;i++)
    {
        cin>>data[i];inp[data[i]]=i;
    }
    cin>>m;
    for(i=1;i<=m;i++)
    {
        cin>>x;
        ans1+=inp[x];
        ans2+=(n-inp[x]+1);
    }
    cout<<ans1<<" "<<ans2<<endl;
    return 0;
}