Compilare: user.cpp: In function ‘void st_pop(long long unsigned int*, long long unsigned int&)’: user.cpp:7:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<n-1;i++) ^ user.cpp: In function ‘int st_add(long long unsigned int*, long long unsigned int&, long long unsigned int)’: user.cpp:18:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:30:22: warning: unused variable ‘j’ [-Wunused-variable] unsigned long long n,j,i,x[8193],nr=0,r,nrr=0,a[8193],v,st[8193]; ^ user.cpp:30:39: warning: unused variable ‘r’ [-Wunused-variable] unsigned long long n,j,i,x[8193],nr=0,r,nrr=0,a[8193],v,st[8193]; ^