/in/foo.cc: In function 'void Tarjan(int)':
/in/foo.cc:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<g[u].size();++i)
                 ~^~~~~~~~~~~~
/in/foo.cc: In function 'void find(int)':
/in/foo.cc:42:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<vi[u].size();++i)
                 ~^~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=0;j<g[i].size();++j)
                     ~^~~~~~~~~~~~
/in/foo.cc:76:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j=0;j<p[i].size();++j) ok[ p[i][j] ]=0;
                         ~^~~~~~~~~~~~
/in/foo.cc:86:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<g[u].size();++i)
                     ~^~~~~~~~~~~~