#include <cstdio> using namespace std; int main(){ int x,y; while (scanf("%d%d",&x,&y)!=EOF) { if (x == 0 && y == 0) { break; } int x1, y1; int x2, y2, x3, y3;// x2 = x3 = x; y2 = y3 = y; whil...