title: Difference Maximum Sum Minimum Sum N M Elementsin Review
signature: function difference_maximum_sum_minimum_sum_n_m_elementsin_review(arr, n, m)
test_code: 
  
  -- SOLUTION CODE
  -- ============================================
  PLACEHOLDER_CODE_BODY
  
  -- TESTING CODE 
  -- ============================================
  function isCorrect(actual, expected)
      if type(expected) ~= type(actual) then
          return false
      end
      
      if type(expected) == 'table' then
          for k,v_expected in pairs(expected) do
              
              if actual[k] == nil then
                  return false
              end
              local v_actual = actual[k]
              if not isCorrect(v_actual, v_expected) then
                  return false
              end
              actual[k]=nil
          end
      
          if next(actual) then 
              return false
          end
          return true
      else
          return actual == expected
      end
  end
  
  function validateSolution(actual, expected)
      return isCorrect(actual,expected)
  end
  
  function driver(arr, n, m, expected)
      local exec_result;
      local status, error_msg = pcall(function () 
          exec_result=PLACEHOLDER_FN_NAME(arr, n, m) 
      end)
      if status then
          if validateSolution(exec_result,expected) then
              return "PASSED"
          end
          return "FAILED"
      else
          return string.format("ERROR=%s",string.gsub(error_msg,".*:[%d]+: ",""))
      end
  end
      
  function main()
      result = driver({2, 3, 6, 16, 21, 22, 23, 27, 27, 28, 29, 29, 31, 31, 37, 37, 38, 40, 41, 43, 51, 52, 53, 55, 55, 56, 57, 63, 67, 67, 67, 72, 75, 79, 82, 84, 91, 92, 93, 96, 96, 97}, 21, 25, 167)
      print(string.format("TEST-0...%s",result))
  
      result = driver({-92, -62, -50, -40, -32, -30, -18, -16, -14, -10, 24, 48, 54, 58, 94}, 8, 12, 206)
      print(string.format("TEST-1...%s",result))
  
      result = driver({0, 0}, 1, 1, 0)
      print(string.format("TEST-2...%s",result))
  
      result = driver({1, 2, 2, 4, 5, 6, 7, 9, 10, 11, 11, 12, 13, 13, 16, 17, 21, 24, 29, 29, 34, 44, 44, 48, 49, 51, 54, 56, 59, 62, 63, 65, 65, 65, 71, 71, 76, 77, 77, 80, 83, 83, 84, 89, 91, 97, 99}, 31, 34, 92)
      print(string.format("TEST-3...%s",result))
  
      result = driver({-90, -58, 6, 16, 20, 34, 36, 38, 48, 66, 82, 84, 86, 90, 90}, 14, 8, 528)
      print(string.format("TEST-4...%s",result))
  
      result = driver({0, 0, 0, 1, 1}, 3, 2, 0)
      print(string.format("TEST-5...%s",result))
  
      result = driver({7, 12, 15, 15, 21, 37, 40, 45, 50, 52, 53, 68, 68, 72, 75, 78, 86, 86, 88}, 16, 18, 2)
      print(string.format("TEST-6...%s",result))
  
      result = driver({-88, -20, 22, 44, 72, 94}, 4, 3, 132)
      print(string.format("TEST-7...%s",result))
  
      result = driver({0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 25, 17, 8)
      print(string.format("TEST-8...%s",result))
  
      result = driver({4, 11, 21, 25, 26, 30, 32, 38, 60, 63, 65, 75, 77, 87, 87, 96}, 12, 15, 19)
      print(string.format("TEST-9...%s",result))
  
  end
  
  main()
source_py: def difference_maximum_sum_minimum_sum_n_m_elementsin_review(arr, n, m):
      max = 0
      min = 0
      arr.sort()
      j = (n - 1)
      for i in range(m):
          min += arr[i]
          max += arr[j]
          j = (j - 1)
      return (max - min)
source_cpp: int difference_maximum_sum_minimum_sum_n_m_elementsin_review(vector<int> arr, int n, int m) {
    int max = 0, min = 0;
    sort(arr.begin(), arr.end());
    for ( int i = 0, j = n - 1;
    i < m;
    i ++, j -- ) {
      min += arr [ i ];
      max += arr [ j ];
    }
    return ( max - min );
  }