#ifndef S0454_4SUM_HPP
#define S0454_4SUM_HPP

#include <vector>
#include <unordered_map>

using namespace std;

class S0454 {
 public:
  int fourSumCount(vector<int>& nums1, vector<int>& nums2, vector<int>& nums3,
                   vector<int>& nums4);
};

#endif