code: def walls_and_gates(rooms):
      for i in range(len(rooms)):
          for j in range(len(rooms[0])):
              if rooms[i][j] == 0:
                  dfs(rooms, i, j, 0)
  
label_desc: Use image node_id 1 for calling a global function with example usage: walls_and_gates(rooms) without return types