Compilare: user.cpp: In function ‘void df1(int)’: user.cpp:16:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<v[x].size();k++) ^ user.cpp: In function ‘void df2(int)’: user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<g[x].size();k++) ^ user.cpp: In function ‘void df(int)’: user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<v[x].size();k++) ^ user.cpp: In function ‘int main()’: user.cpp:71:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<v[nod].size();k++) ^