http://poj.org/problem?id=1687 #include<iostream> #include"math.h" using namespace std; long x[50],y[50]; inline long cheng(int a,int b,int c) {return (x[a]-x[b])*(y[a]-y[c])-(x[a]-x[c])*(y[a]-y[b]);} int main() {int t,n,m,p[50],h,key,i,j,l;char s[50];long an,anb; cin>>t; for(;t>0;t--) {cin>>n; for(i=0;i<n;i++) cin>>x[i]>>y[i]; cin>>m;key=0;anb=0; for(l=0;l<m;l++) {cin>>h; for(i=0;i<h;i++){cin>>p[i];p[i]--;} an=0; for(i=1;i<h-1;i++) { an+=cheng(p[0],p[i],p[i+1]); } // cout<<":::"<<an<<endl; if(abs(an)>anb){anb=abs(an);key=l+1; } } cout<<key<<endl; } return 1; }
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