Compilare: user.cpp: In function ‘void s_top(int)’: user.cpp:15:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<v[x].size();k++) ^ user.cpp: In function ‘void df(int)’: user.cpp:27:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<w[nod].size();k++) ^ user.cpp: In function ‘int main()’: user.cpp:56:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<tc[i].size();j++) ^