foo.cc: In function 'void dfs(int)':
foo.cc:81:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<a1[x].size();i++) c1[a1[x][i]]++;
              ~^~~~~~~~~~~~~
foo.cc:82:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<b1[x].size();i++) c1[b1[x][i]]--;
              ~^~~~~~~~~~~~~
foo.cc:83:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<a2[x].size();i++) c2[a2[x][i]+n]++;
              ~^~~~~~~~~~~~~
foo.cc:84:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<b2[x].size();i++) c2[b2[x][i]+n]--;
              ~^~~~~~~~~~~~~

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