answer.code:111:20: error: ‘chrono’ has not been declared
  111 | const int RANDOM = chrono::high_resolution_clock::now().time_since_epoch().count();
      |                    ^~~~~~
answer.code: In function ‘void process(int)’:
answer.code:128:38: error: invalid initialization of reference of type ‘__gnu_pbds::gp_hash_table<int, long long int>&’ from expression of type ‘__gnu_pbds::gp_hash_table<int, long long int, chash>’
  128 |             dfs(to, children.back(), old, c);
      |                                      ^~~
answer.code:80:64: note: in passing argument 3 of ‘void dfs(int, std::vector<int>&, __gnu_pbds::gp_hash_table<int, long long int>&, int)’
   80 | void dfs(int v, vector<int>& p, gp_hash_table<int, long long>& old, int prev = -1) {
      |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
answer.code:135:38: error: invalid initialization of reference of type ‘__gnu_pbds::gp_hash_table<int, long long int>&’ from expression of type ‘__gnu_pbds::gp_hash_table<int, long long int, chash>’
  135 |         rollback(children[child_id], old, c);
      |                                      ^~~
answer.code:99:62: note: in passing argument 2 of ‘void rollback(std::vector<int>&, __gnu_pbds::gp_hash_table<int, long long int>&, int)’
   99 | void rollback(vector<int>& v, gp_hash_table<int, long long>& old, int prev = -1) {
      |                               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
answer.code:150:31: error: invalid initialization of reference of type ‘__gnu_pbds::gp_hash_table<int, long long int>&’ from expression of type ‘__gnu_pbds::gp_hash_table<int, long long int, chash>’
  150 |         rollback(children[i], old, c);
      |                               ^~~
answer.code:99:62: note: in passing argument 2 of ‘void rollback(std::vector<int>&, __gnu_pbds::gp_hash_table<int, long long int>&, int)’
   99 | void rollback(vector<int>& v, gp_hash_table<int, long long>& old, int prev = -1) {
      |                               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
answer.code:163:35: error: invalid initialization of reference of type ‘__gnu_pbds::gp_hash_table<int, long long int>&’ from expression of type ‘__gnu_pbds::gp_hash_table<int, long long int, chash>’
  163 |         rollbackdist(children[i], old, c);
      |                                   ^~~
answer.code:105:66: note: in passing argument 2 of ‘void rollbackdist(std::vector<int>&, __gnu_pbds::gp_hash_table<int, long long int>&, int)’
  105 | void rollbackdist(vector<int>& v, gp_hash_table<int, long long>& old, int prev = -1) {
      |                                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~