Compilare: main.cpp: In function 'int main()': main.cpp:30:10: warning: statement has no effect [-Wunused-value] for(i;i<=n;i++) ^ main.cpp:9:19: warning: unused variable 'j' [-Wunused-variable] long long n,i,j,k,suma=0,level,x,lcur=0,dcur=0,lx = 0,dx = 0; ^ main.cpp:9:21: warning: unused variable 'k' [-Wunused-variable] long long n,i,j,k,suma=0,level,x,lcur=0,dcur=0,lx = 0,dx = 0; ^ main.cpp:9:30: warning: unused variable 'level' [-Wunused-variable] long long n,i,j,k,suma=0,level,x,lcur=0,dcur=0,lx = 0,dx = 0; ^~~~~