Compilare: user.cpp: In function ‘int main()’: user.cpp:11:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ user.cpp:34:5: warning: ‘dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=st;i<=dr;i++) ^ user.cpp:34:5: warning: ‘st’ may be used uninitialized in this function [-Wmaybe-uninitialized]