/in/foo.cc: In function 'void dij(int)':
/in/foo.cc:40:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(vis[x]) continue;vis[x]=1;
   ^~
/in/foo.cc:40:23: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   if(vis[x]) continue;vis[x]=1;
                       ^~~
/in/foo.cc: In function 'void dfs(int)':
/in/foo.cc:56:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<fas[x].size();i++) if(!vis[fas[x][i]])
              ~^~~~~~~~~~~~~~
/in/foo.cc: In function 'void tarjan(int, int)':
/in/foo.cc:65:19: warning: unused variable 'top' [-Wunused-variable]
  static int tim=0,top=0;
                   ^~~
/in/foo.cc: At global scope:
/in/foo.cc:65:19: warning: 'top' defined but not used [-Wunused-variable]