Compilare: user.cpp: In function ‘void DF(int, int)’: user.cpp:17:9: warning: unused variable ‘vec’ [-Wunused-variable] int vec, sz = v[nod].size(), i; ^ user.cpp: In function ‘int main()’: user.cpp:56:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=e.size();i++) M[i][0]=i; //RMQ ^ user.cpp:57:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;(1<<j)<=e.size();++j){ ^ user.cpp:58:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=e.size() - (1<<j) + 1;++i){ ^