/in/foo.cc: In function 'void bianli(int)':
/in/foo.cc:31:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<(q[dq].G).size();i++) 
              ~^~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void dfs(int)':
/in/foo.cc:38:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<(q[dq].G).size();i++)
          ~^~~~~~~~~~~~~~~~~
/in/foo.cc:46:25: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(Begin[u]<=Begin[s] && End[u]<=End[s] || Begin[u]<=Begin[t] && End[u]<=End[t]) 
      ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~