Compilare: user.cpp: In function ‘int main()’: user.cpp:52:34: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘std::vector<double>::size_type {aka long unsigned int}’ [-Wformat=] fprintf(OUT,"%d\n",out.size()); ^ user.cpp:53:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<out.size();i++) ^ user.cpp:29:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%lf",&N,&L); ^ user.cpp:32:80: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%lf%lf%lf%lf%d",&q[i].x1,&q[i].x2,&q[i].y1,&q[i].y2,&q[i].v); ^