code: def insert(self, val):
      if val in self.num_to_idx:
          return False
      else:
          self.num_list.append(val)
          self.num_to_idx[val] = len(self.num_list) - 1
          return True
  
imports: import random
label_desc: Use image node_id 2 for calling the RandomizedSet obj's underlying member method code with example usage: obj.insert(val) and returns: False, True