Compilare: user.cpp: In function ‘int main()’: user.cpp:46:42: warning: unused variable ‘k’ [-Wunused-variable] long n,b,a,m,arb[200002],v[100001],i,k=-1; ^ user.cpp: In function ‘long int z(long int*, long int, long int, long int, long int, long int)’: user.cpp:10:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘long int e(long int*, long int, long int, long int, long int, long int)’: user.cpp:17:1: warning: control reaches end of non-void function [-Wreturn-type] } ^