Compilare: user.cpp: In function ‘int read()’: user.cpp:27:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void toposort(int)’: user.cpp:87:34: 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:112:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[a].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:179:14: warning: deleting array ‘v’ [enabled by default] delete[] v; ^