Compilare: user.cpp: In function ‘int main()’: user.cpp:42:14: warning: unused variable ‘aux’ [-Wunused-variable] int i,n,j,aux; ^ user.cpp:46:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lld %lld" ,&a,&b); ^ user.cpp:42:10: warning: ‘n’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i,n,j,aux; ^