/in/foo.cc: In function 'void tarjan(int)':
/in/foo.cc:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<Edge[u].size();i++)
                 ~^~~~~~~~~~~~~~~
/in/foo.cc:43:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int k=0;k<Edge[temp[j]].size();k++)
                         ~^~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:66:11: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
         if(!out[i])
           ^