28LCP21.N1~NNedges[ab]abDFSBFS#defineINF0x3f3f3f3fclassSolution{vector>adj;vectordepthparent;vectorin_loop;intnloop=0;70268C++87.69%80.8MBC++88.61%5555BUFFBUFFBUFF201C++99.99%60.8MBC++99.99%1301307130