/in/foo.cc: In function 'void DP(int)':
/in/foo.cc:14:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < son[k].size(); i++)
                         ~~^~~~~~~~~~~~~~~
/in/foo.cc:13:13: warning: unused variable 'chose' [-Wunused-variable]
         int chose = 0, chosenot = 0;
             ^~~~~
/in/foo.cc:13:24: warning: unused variable 'chosenot' [-Wunused-variable]
         int chose = 0, chosenot = 0;
                        ^~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:30:13: warning: unused variable 'root' [-Wunused-variable]
         int root;
             ^~~~