Compilare: main.cpp: In function 'void dfs(int)': main.cpp:13:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<gr[nod].size(); i++) ~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:25:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<gt[nod].size(); i++) ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<afis[grp[i]].size(); j++) fout << afis[grp[i]][j] << " "; ~^~~~~~~~~~~~~~~~~~~~