foo.cc: In function 'void tarjan(int)':
foo.cc:28:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[x].size();i++)
              ~^~~~~~~~~~~~
foo.cc: In function 'void delnode()':
foo.cc:61:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<g[x].size();i++)
               ~^~~~~~~~~~~~
foo.cc: In function 'void fz_bag(int)':
foo.cc:76:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[x].size();i++)
              ~^~~~~~~~~~~~
foo.cc: In function 'void dfs(int)':
foo.cc:88:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[x].size();i++)
              ~^~~~~~~~~~~~

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