Runtime Error
/in/foo.cc: In function 'void Dfs(int, int)':
/in/foo.cc:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<T[u].size();i++)
~^~~~~~~~~~~~
/in/foo.cc: In function 'void Dfs(int, int)':
/in/foo.cc:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<T[u].size();i++)
~^~~~~~~~~~~~
