Compilare: user.cpp: In function ‘int main()’: user.cpp:11:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:14:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^ user.cpp:21:30: warning: ‘dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<smax<<" "<<st<<" "<<dr; ^ user.cpp:21:23: warning: ‘st’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<smax<<" "<<st<<" "<<dr; ^~~