LA 4728 Square, returns the diameter of a polygon by rotating the jamming method, 4728

LA 4728 Square, returns the diameter of a polygon by rotating the jamming method, 4728

Given some square, let you calculate the square of the maximum distance between these square vertices.

// Returns the square int diameter2 (vector <Point> & points) {vector <Point> p = ConvexHull (points); int n = p. size (); if (n = 1) return 0; if (n = 2) return Dist2 (p [0], p [1]); p. push_back (p [0]); int ans = 0; for (int u = 0, v = 1; u <n; ++ u) {(;;) {int diff = Cross (p [u + 1]-p [u], p [v + 1]-p [v]); if (diff <= 0) {ans = max (ans, Dist2 (p [u], p [v]); if (diff = 0) ans = max (ans, dist2 (p [u], p [v + 1]); break;} v = (v + 1) % n ;}} return ans ;}