LightOJ 1305 Area of a Parallelogram - Basic Geometry

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题意：根据平行四边形A、B、C 3点坐标求D点坐标，并求出面积

//AcerGY//#pragma comment (linker, "/STACK:1024000000,1024000000")#include <iostream>#include <cstdio>#include <algorithm>#include <cstring>#include <queue>#include <vector>#include <cmath>#define ll long long#define BUG puts("BUG!")#define ci(val) scanf("%d",&val)#define pi(val) printf("%d\n",val)#define clr(a,val) memset(a,val,sizeof(a))#define lowbit(x) ((x)&(-x))#define inf 0x3f3f3f3f#define inf64 1LL<<60#define PI acos(-1.0)#define eps 1e-8//Game Theory#define P "First"#define N "Second"#define maxn 10000#define mod 10009using namespace std;void readfile(char s[]){#ifndef ONLINE_JUDGEfreopen(s,"r",stdin);#endif}int ax,ay,bx,by,cx,cy,dx,dy;int main(){ios::sync_with_stdio(0);readfile("in.txt");int T , cas = 1;scanf("%d",&T);while(T--){scanf("%d%d%d%d%d%d",&ax,&ay,&bx,&by,&cx,&cy);dx = ax-(bx-cx) , dy = ay-(by-cy);int area = area=abs(ax*(by-cy)+bx*(cy-ay)+cx*(ay-by));printf("Case %d: %d %d %d\n",cas++,dx,dy,area);}return 0;}