#ifndef S0015_3SUM
#define S0015_3SUM

#include <vector>
#include <unordered_map>
#include <algorithm>

using namespace std;

class Solution1 {
 public:
  vector<vector<int>> threeSum(vector<int>& nums);
};

class Solution2 {
 public:
  vector<vector<int>> threeSum(vector<int>& nums);
};

#endif