Compilare: main.cpp: In function 'void DFS2(int, int)': main.cpp:29:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < Ad[nod].size(); ++i ) ~~^~~~~~~~~~~~~~~~ main.cpp:43:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<Ad[nod].size(); ++j) ~^~~~~~~~~~~~~~~