Compilare: user.cpp: In function ‘bool commonlevel(const int&, const int&)’: user.cpp:38:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(level > V[Q[i]].size() || V[Q[i]][level] != V[Q[1]][level]) ^ user.cpp: In function ‘int main()’: user.cpp:76:15: warning: unused variable ‘x’ [-Wunused-variable] int n,q,m,x; ^ user.cpp: In function ‘int binary(int)’: user.cpp:71:1: warning: control reaches end of non-void function [-Wreturn-type] } ^