Compilare: user.cpp: In function ‘void print()’: user.cpp:28:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<solution.size();i++) ^ user.cpp: In function ‘void solve()’: user.cpp:56:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<E[x].size();i++) ^ user.cpp:41:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,node,k=1; ^