code: def sumRange(self, i, j):
      """
      sum of elements nums[i..j], inclusive.
      :type i: int
      :type j: int
      :rtype: int
      """
      return self.res[j + 1] - self.res[i]
  
label_desc: Use image node_id 2 for calling the NumArray obj's underlying member method code with example usage: obj.sumRange(i, j) and returns: unknown