Compilare: user.cpp: In function ‘int main()’: user.cpp:28:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < hull.size(); i++) { ^ user.cpp: In function ‘std::vector<punct> convexHull(std::vector<punct>)’: user.cpp:39:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < points.size(); i++) { ^ user.cpp:47:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < points.size(); i++) { ^ user.cpp:48:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < points.size(); j++) { ^ user.cpp:51:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < points.size(); k++) { ^ user.cpp:53:38: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (points[i].x == points[j].x && points[i].x == points[k].x || points[i].y == points[j].y && points[i].y == points[k].y) { ^ user.cpp:71:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == points.size()) { ^ user.cpp:73:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (count = 0; count < hull.size(); count++) { ^ user.cpp:78:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (count == hull.size()) { ^ user.cpp: In function ‘int main()’: user.cpp:20:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:23:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &q.x, &q.y); ^