Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:12:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[nod].size(); i++){ ^ user.cpp:27:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[nod].size(); i++){ ^ user.cpp:41:13: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(w[u] != x){ ^