Compilare: user.c: In function ‘main’: user.c:10:9: warning: unused variable ‘cont’ [-Wunused-variable] int cont=0,nr=2,j,i; ^ user.c:9:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&r,&d); ^ user.c:37:12: warning: ‘ok’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout,"%d",sol*2+ok); ^