Compilare: user.cpp: In function ‘void rmq(int)’: user.cpp:28:9: warning: unused variable ‘el’ [-Wunused-variable] int el=lg[n]; ^ user.cpp: In function ‘int lca(int, int)’: user.cpp:39:33: warning: unused variable ‘i’ [-Wunused-variable] int n1=first[a],n2=first[b],i,j,x; ^ user.cpp:39:35: warning: unused variable ‘j’ [-Wunused-variable] int n1=first[a],n2=first[b],i,j,x; ^ user.cpp:39:37: warning: unused variable ‘x’ [-Wunused-variable] int n1=first[a],n2=first[b],i,j,x; ^ user.cpp: In function ‘int main()’: user.cpp:49:15: warning: unused variable ‘j’ [-Wunused-variable] int n,m,i,j,a,b; ^