The operation codes defined in the enhanced project description are different from that in the original description.
Here is the clarification:
===========================================================================
INIT_QUADTREE(int w):  (OPCODE = 1)
DISPLAY():  (OPCODE = 2)
LIST_RECTANGLES():  (OPCODE = 3)
CREATE_RECTANGLE(string R, int x1, int y1, int x2, int y2):  (OPCODE = 4)
CREATE_RECTANGLE_RANDOM(string R): (OPCODE = 4)
RECTANGLE_SEARCH(string R): (OPCODE = 5)
INSERT(string R): (OPCODE = 6)
SEARCH_POINT(int x, int y):  (OPCODE = 7)
DELETE_RECTANGLE(string R): (OPCODE = 8)
DELETE_POINT(int x, int y):  (OPCODE = 8)
MOVE(string R, int x, int y): (OPCODE = 9)
TOUCH(string R): (OPCODE = 10)
WITHIN(string R, int d):  (OPCODE = 11)
HORIZ_NEIGHBOR(string R): (OPCODE = 12)
VERT_NEIGHBOR(string R): (OPCODE = 12)
NEAREST_RECTANGLE(int x, int y):  (OPCODE = 13)
WINDOW(int x1, int y1, int x2, int y2):  (OPCODE = 14)
NEAREST_NEIGHBOR(string R): (OPCODE = 15)
LEXICALLY_GREATER_NEAREST_NEIGHBOR(string R): (OPCODE = 16)
LABEL():  (OPCODE = 17)
===========================================================================
Please follow the codes above to complete the 2nd part of the project.