/in/foo.cc: In function 'int dp1(int)':
/in/foo.cc:29:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int k=0;k<g[i].size();k++){
              ~^~~~~~~~~~~~
/in/foo.cc: In function 'int dp2(int)':
/in/foo.cc:40:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int k=0;k<gr[i].size();k++){
              ~^~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:64:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=0;k<g[i].size();k++){
               ~^~~~~~~~~~~~