Compilare: user.cpp: In function ‘void df(int)’: user.cpp:17:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nodul].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:35:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<a[i].size();j++) ^ user.cpp:38:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<a[a[i][j].v].size()&&!ok;k++) ^ user.cpp:45:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<a[i].size();j++) ^