Eroare de compilare: user.cpp: In function ‘void read()’: user.cpp:29:24: error: return-statement with a value, in function returning 'void' [-fpermissive] return 0; ^ user.cpp: In function ‘void toposort(int)’: user.cpp:86:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp: In function ‘bool con(int, int)’: user.cpp:111:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[a].size();i++) ^