#include<bits/stdc++.h> using namespace std; using ll=long long; #define debug(x) cout<<#x<<‘ ‘<<x<<endl // int main() { ll x1,y1,x2,y2,x3,y3; while (cin>>x1>>y1>>x2>>y2>>x3>>y3) { ll ans=abs(x1*y2+x2*y3+x3*y1-x1*y3-x2*y1-x3*y2)*11; printf("%lld\n",ans); } return 0; }
https://ac.nowcoder.com/acm/contest/881#question F题
原文：https://www.cnblogs.com/downrainsun/p/11216764.html