Compilare: user.cpp: In function ‘int main()’: user.cpp:49:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<L[i].size();j++){ ^ user.cpp:26:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:28:54: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lf%lf%lf",&v[i].x,&v[i].y,&v[i].r); ^