Compilare: user.c: In function ‘main’: user.c:4:29: warning: unused variable ‘con’ [-Wunused-variable] unsigned long long x,y,com,con,n,gasit=0; ^ user.c:6:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%llu %llu",&x,&y); ^ user.c:28:18: warning: ‘com’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(gasit)fprintf(f,"%llu %llu",com,n-com); ^