/in/foo.cc: In function 'int dp(int, int)':
/in/foo.cc:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<child[root].size();i++){
                 ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:33:9: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int root;
         ^~~~