#include <iostream> using namespace std; struct thr { int x; int y; }; int n; const int N=105; thr t[N]; bool isline(thr a, thr b,thr c) { int zuo=(c.y-b.y)*(b.x-a.x); int you=(c.x-b.x)*(b.y-a.y); if(zuo!=you) return 1; else return 0; } int main() { cin...