/in/foo.cc: In function 'std::__cxx11::string dfs(int)':
/in/foo.cc:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0;i<ss.size();i++)
~^~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:54:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i=0;i<it.second.size();i++)
~^~~~~~~~~~~~~~~~~
/in/foo.cc:56:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
printf("%d%c",it.second[i],"=\n"[i==it.second.size()-1]);
~^~~~~~~~~~~~~~~~~~~~