/in/foo.cc: In function 'void tarjan(int)':
/in/foo.cc:19:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<edge[u].size();i++)
                 ~^~~~~~~~~~~~~~~
/in/foo.cc:42:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if(f[u]==0&&s[u]>1 || (f[u] && flag))
        ~~~~~~~^~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:64:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=1;i<cut_point.size();i++)
                     ~^~~~~~~~~~~~~~~~~
/in/foo.cc:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<cut_edge.size();i++)
                     ~^~~~~~~~~~~~~~~~