Compilare: user.cpp: In function ‘void dfs_construire_nivel(int, int)’: user.cpp:21:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[nod].size();++i) ^ user.cpp: In function ‘void dfs_vizitare_crengi(int)’: user.cpp:30:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[nod].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:61:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<lvele[i].size();++j) ^