/in/foo.cc: In function 'void DP(int)':
/in/foo.cc:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<vec[u].size();i++)
              ~^~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:45:8: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d\n",min(f[0][s],f[1][s]));
  ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~