Compilare: user.cpp: In function ‘void enlarge(poly&, point)’: user.cpp:39:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < robot.size(); ++j) ^ user.cpp: In function ‘int get_area(const poly&)’: user.cpp:75:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i + 1 < p.size(); ++i) area += p[i].x * p[i+1].y - p[i+1].x * p[i].y; ^ user.cpp: In function ‘int get_area(point, const poly&)’: user.cpp:81:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i + 1 < p.size(); ++i) { ^ user.cpp: In function ‘int on_side(point, const poly&)’: user.cpp:94:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i + 1 < p.size(); ++i) ^ user.cpp: In function ‘int intersect(point, point, const poly&)’: user.cpp:124:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i + 1 < p.size(); ++i) ^ user.cpp:134:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i + 1 < p.size(); ++i) get_intersection(a, b, p[i], p[i+1], sp); ^ user.cpp: In function ‘double get_dist(point, point)’: user.cpp:139:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < obst.size(); ++i) if (intersect(a, b, obst[i])) return 1e9; ^ user.cpp: In function ‘int main()’: user.cpp:161:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < robot.size(); ++i) r = min(r, robot[i]); ^ user.cpp:162:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < obst.size(); ++i) enlarge(obst[i], r); ^ user.cpp:164:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < robot.size(); ++i) miny = min(miny, robot[i].y); ^ user.cpp:171:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < obst.size(); ++i) { ^ user.cpp:172:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < obst[i].size(); ++j) v.pb(obst[i][j]); ^ user.cpp:175:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); ++i) ^ user.cpp:185:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); ++i) if (!done[i] && dist[i] < min_d) { poz = i; min_d = dist[i]; } ^ user.cpp:187:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]