#ifndef S0023_MERGE_K_SORTED_LISTS_HPP
#define S0023_MERGE_K_SORTED_LISTS_HPP

#include <vector>

#include "structures.hpp"

using namespace std;

class S0023 {
 public:
  ListNode *mergeKLists(vector<ListNode *> &lists);
  ListNode *mergeTwoLists(ListNode *a, ListNode *b);
  ListNode *merge(vector<ListNode *> &lists, int l, int r);
};

#endif