Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<vec[nod].size(); i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs_2(int)': main.cpp:73:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<vec[nod].size(); i++) ~^~~~~~~~~~~~~~~~