foo.cc: In function 'void dfs()':
foo.cc:72:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(Cur2+1!=Edge[Cur].size())
               ~~~~~~^~~~~~~~~~~~~~~~~~
foo.cc: In function 'void dfs2()':
foo.cc:117:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(Cur2+1!=Edge2[Cur].size())
               ~~~~~~^~~~~~~~~~~~~~~~~~~

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