Compilare: user.cpp: In function ‘void topSort(int)’: user.cpp:19:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < gr[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:42:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < rez.size(); ++i) fout<<rez[i]<<" "; ^