Compilare: user.cpp: In function ‘void mk_convex(std::vector<punct>&)’: user.cpp:33:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < v.size(); ++i){ ^ user.cpp: In function ‘double best_win(const std::vector<double>&)’: user.cpp:49:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < v.size()-1; ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:62:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:65:63: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%hd %hd %hd", &v[i].x, &v[i].y, &v[i].dist); ^