/in/foo.cc: In function 'void init(int, int)':
/in/foo.cc:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<a[u].size(); i++)
                  ~^~~~~~~~~~~~
/in/foo.cc: In function 'int work(int, int)':
/in/foo.cc:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<a[u].size(); i++)
                  ~^~~~~~~~~~~~
/in/foo.cc: In function 'void dfs(int)':
/in/foo.cc:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<d[dep].size(); i++)
                  ~^~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:42:18: error: expected ';' before ')' token
         cin>>x>>y);
                  ^