/in/foo.cc: In function 'int dp_(int, int)':
/in/foo.cc:42:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<ed[u].size();i++){
              ~^~~~~~~~~~~~~
/in/foo.cc: In function 'int read_()':
/in/foo.cc:22:14: warning: 'c' is used uninitialized in this function [-Wuninitialized]
  while(c<'0' || c>'9'){
        ~~~~~~^~~~~~~~