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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define test  \
  4.     int t;    \
  5.     cin >> t; \
  6.     while (t--)
  7. #define ll long long
  8. #define endl '\n'
  9. #define cendl cout << endl
  10. #define cyes cout << "YES" << endl
  11. #define cno cout << "NO" << endl
  12. #define InTheNameOfAllah          \
  13.     ios_base::sync_with_stdio(0); \
  14.     cin.tie(0);
  15.  
  16. struct point {
  17.     double x, y;
  18. };
  19. bool cmp(point p1, point p2) {
  20.     return p1.x == p2.x && p1.y == p2.y;
  21. }
  22. int main() {
  23.     InTheNameOfAllah
  24.         point p1,
  25.         p2, p3, p4;
  26.     while (cin >> p1.x >> p1.y >> p2.x >> p2.y >> p3.x >> p3.y >> p4.x >> p4.y) {
  27.         if (p1.y > p2.y)
  28.             swap(p1, p2);
  29.  
  30.         double dx = p2.x - p1.x, dy = p2.y - p1.y;
  31.         cout << fixed << setprecision(3);
  32.         if (cmp(p3, p1)) {
  33.             p4.x += dx;
  34.             p4.y += dy;
  35.             cout << p4.x << ' ' << p4.y << endl;
  36.         } else if (cmp(p3, p2)) {
  37.             p4.x -= dx;
  38.             p4.y -= dy;
  39.             cout << p4.x << ' ' << p4.y << endl;
  40.         } else {
  41.           swap(p3,p4);
  42.           if (cmp(p3, p1)) {
  43.             p4.x += dx;
  44.             p4.y += dy;
  45.             cout << p4.x << ' ' << p4.y << endl;
  46.         } else if (cmp(p3, p2)) {
  47.             p4.x -= dx;
  48.             p4.y -= dy;
  49.             cout << p4.x << ' ' << p4.y << endl;
  50.         } 
  51.         }
  52.  
  53.     }
  54.     return 0;
  55. }
Success #stdin #stdout 0.01s 5304KB
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https://ideone.com/mdXJ1Y
language:
C++ 4.3.2 (gcc-4.3.2)
created:
12 days ago
visibility:
public

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