2019-12-13 - Care Package
(original .ipynb)
Day 13 puzzle input is an IntCode program (mine is here) which represents a game similar to arkanoid/breakout, and outputs a sequence of commands which can be interpreted to draw a game state. Part 1 involves initializing the game and counting the number of "block" tiles that are on screen. Part 2 involves actually playing the game until you break all the blocks and finding your score.
opcode_add = 1
opcode_mul = 2
opcode_read = 3
opcode_write = 4
opcode_jump_true = 5
opcode_jump_false = 6
opcode_lt = 7
opcode_eq = 8
opcode_rebase = 9
opcode_terminate = 99
mode_position = 0
mode_immediate = 1
mode_relative = 2
class IntCodeCpu:
def __init__(self, memory_image):
self.memory = [ x for x in memory_image ] # copy memory image, in case it's reused
self.stalled = True
self.input_buffer = None
self.output_buffer = None
self.pc = 0
self.initialise_opcodes()
self.offset = 0
self.done = False
def start(self, input_buffer, output_buffer, noun=None, verb=None):
self.input_buffer = input_buffer
self.output_buffer = output_buffer
if noun:
self.memory[1] = noun
if verb:
self.memory[2] = verb
return self.run()
def run(self):
instr = self.memory[self.pc]
self.stalled = False
while int(instr) != opcode_terminate and not self.stalled:
(op, modes) = self.decode_instr(instr)
self.pc = op(modes)
instr = self.memory[self.pc]
return self.memory[0]
#-HELPERS-----------------------------
def try_pop_mode(self, modes):
if len(modes) == 0:
return 0
return modes.pop()
def resize_memory(self, target_addr):
self.memory += ([0] * (1 + target_addr - len(self.memory)))
#-DECODE-INSTRUCTIONS-----------------
def initialise_opcodes(self):
self.opcodes = {
opcode_add: self.op_add,
opcode_mul: self.op_mul,
opcode_read: self.op_read,
opcode_write: self.op_write,
opcode_jump_true: self.op_jump_true,
opcode_jump_false: self.op_jump_false,
opcode_lt: self.op_lt,
opcode_eq: self.op_eq,
opcode_rebase: self.op_rebase
}
def decode_instr(self, instr):
instr = str(instr)
opcode = self.decode_op(instr)
modes = self.decode_modes(instr)
if not (opcode in self.opcodes):
raise Exception(f"Invalid opcode {opcode}")
return (self.opcodes[opcode], modes)
def decode_op(self, instr):
if len(instr) > 2:
return int(instr[-2:])
return int(instr)
def decode_modes(self, instr):
if len(instr) > 2:
return [ int(d) for d in instr[:-2]]
return []
#-MICRO-OPS---------------------------
def uop_read(self, value, mode):
if mode == mode_position:
if value >= len(self.memory):
self.resize_memory(value)
return int(self.memory[value])
elif mode == mode_relative:
if self.offset + value >= len(self.memory):
self.resize_memory(self.offset + value)
return int(self.memory[self.offset + value])
elif mode == mode_immediate:
return int(value)
else:
raise Exception("UNKNOWN MODE")
def uop_write(self, dst, value, mode):
if mode == mode_position:
if dst >= len(self.memory):
self.resize_memory(dst)
self.memory[dst] = value
elif mode == mode_relative:
if self.offset + dst >= len(self.memory):
self.resize_memory(self.offset + dst)
self.memory[self.offset + dst] = value
elif mode == mode_immediate:
raise Exception(f"cannot write {value} to literal {dst}")
def uop_cond_jump(self, modes, cond):
param_mode = self.try_pop_mode(modes)
param_raw = int(self.memory[self.pc + 1])
param = self.uop_read(param_raw, param_mode)
dest_mode = self.try_pop_mode(modes)
dest_raw = int(self.memory[self.pc + 2])
dest = self.uop_read(dest_raw, dest_mode)
if cond(param):
return dest
return self.pc + 3
def uop_cmp(self, modes, cmp):
param0_mode = self.try_pop_mode(modes)
param0_raw = int(self.memory[self.pc + 1])
param0 = self.uop_read(param0_raw, param0_mode)
param1_mode = self.try_pop_mode(modes)
param1_raw = int(self.memory[self.pc + 2])
param1 = self.uop_read(param1_raw, param1_mode)
dest_mode = self.try_pop_mode(modes)
dest = int(self.memory[self.pc + 3])
if cmp(param0, param1):
self.uop_write(dest, 1, dest_mode)
else:
self.uop_write(dest, 0, dest_mode)
return self.pc + 4
#-OPCODES-----------------------------
def op_add(self, modes):
arg0_mode = self.try_pop_mode(modes)
arg1_mode = self.try_pop_mode(modes)
dest_mode = self.try_pop_mode(modes)
arg0_raw = int(self.memory[self.pc + 1])
arg1_raw = int(self.memory[self.pc + 2])
dest = int(self.memory[self.pc + 3])
arg0 = self.uop_read(arg0_raw, arg0_mode)
arg1 = self.uop_read(arg1_raw, arg1_mode)
self.uop_write(dest, str(int(arg0) + int(arg1)), dest_mode)
return self.pc + 4
def op_mul(self, modes):
arg0_mode = self.try_pop_mode(modes)
arg1_mode = self.try_pop_mode(modes)
dest_mode = self.try_pop_mode(modes)
arg0_raw = int(self.memory[self.pc + 1])
arg1_raw = int(self.memory[self.pc + 2])
dest = int(self.memory[self.pc + 3])
arg0 = self.uop_read(arg0_raw, arg0_mode)
arg1 = self.uop_read(arg1_raw, arg1_mode)
self.uop_write(dest, str(int(arg0) * int(arg1)), dest_mode)
return self.pc + 4
def op_read(self, modes):
dest_mode = self.try_pop_mode(modes)
dest = int(self.memory[self.pc + 1])
# if the input buffer is empty, we should "stall" and
# resume later
if not self.input_buffer:
self.stalled = True
return self.pc
val = self.input_buffer.pop()
self.uop_write(dest, str(val), dest_mode)
return self.pc + 2
def op_write(self, modes):
src_mode = self.try_pop_mode(modes)
src_raw = int(self.memory[self.pc + 1])
src = self.uop_read(src_raw, src_mode)
self.output_buffer.append(src)
return self.pc + 2
def op_jump_true(self, modes):
return self.uop_cond_jump(modes, lambda x: x != 0)
def op_jump_false(self, modes):
return self.uop_cond_jump(modes, lambda x: x == 0)
def op_lt(self, modes):
return self.uop_cmp(modes, lambda x, y: x < y)
def op_eq(self, modes):
return self.uop_cmp(modes, lambda x, y: x == y)
def op_rebase(self, modes):
param_mode = self.try_pop_mode(modes)
param_raw = int(self.memory[self.pc + 1])
param = self.uop_read(param_raw, param_mode)
self.offset += param
return self.pc + 2
# 0 is an empty tile. No game object appears in this tile.
# 1 is a wall tile. Walls are indestructible barriers.
# 2 is a block tile. Blocks can be broken by the ball.
# 3 is a horizontal paddle tile. The paddle is indestructible.
# 4 is a ball tile. The ball moves diagonally and bounces off objects.
tile_none = -1
tile_empty = 0
tile_wall = 1
tile_block = 2
tile_paddle = 3
tile_ball = 4
tiles = {
tile_none: " ",
tile_empty: ".",
tile_wall: "#",
tile_block: "=",
tile_paddle: "_",
tile_ball: "*"
}
code = open("puzzle_input/day13.txt", "r").read().strip().split(",")
def parse_game_draw_instructions(raw_instructions):
assert 0 < len(raw_instructions)
assert 0 == len(raw_instructions) % 3
instructions = []
while raw_instructions:
x = raw_instructions.pop(0)
y = raw_instructions.pop(0)
tile = raw_instructions.pop(0)
instructions.append([x, y, tile])
return instructions
def find_block_tiles():
cpu = IntCodeCpu(code)
input_buffer = []
output_buffer = []
cpu.start(input_buffer, output_buffer)
instructions = parse_game_draw_instructions(cpu.output_buffer)
return len([ 1 for x, y, tile_id in instructions if tile_id == tile_block])
print(find_block_tiles())
420
def generate_screen(x=40, y=23):
screen = []
for row in range(y + 1):
screen.append([ tile_none ] * (x + 1))
return screen
class AsciiPrinter:
def __init__(self):
self.screen = generate_screen()
def plot(self, x, y, tile):
self.screen[y][x] = tile
def render_game(output_buffer, printer):
tiles_to_draw = parse_game_draw_instructions(output_buffer)
score = ""
ball_position = None
paddle_position = None
for tile_detail in tiles_to_draw:
x_str, y_str, tile_str = tile_detail
x = int(x_str)
y = int(y_str)
tile = int(tile_str)
if y > 0 and x >= 0:
printer.plot(x, y, tile)
if tile == tile_ball:
ball_position = (x, y)
if tile == tile_paddle:
paddle_position = (x, y)
elif x == -1 and y == 0:
score = tile_str
return (ball_position, paddle_position, score)
def signed_unit(n):
if n == 0:
return 0
return int(abs(n)/n)
def run_game():
cpu = IntCodeCpu(code)
cpu.memory[0] = 2
input_buffer = [0]
output_buffer = []
cpu.start(input_buffer, output_buffer)
paddle_pos = None
screen = AsciiPrinter()
score = None
while cpu.stalled or cpu.output_buffer:
ball_pos, maybe_paddle_pos, score = render_game(cpu.output_buffer, screen)
if not ball_pos:
break
ball_x, ball_y = ball_pos
if maybe_paddle_pos:
paddle_pos = maybe_paddle_pos
paddle_x, paddle_y = paddle_pos
difference = ball_x - paddle_x
cpu.input_buffer.append(signed_unit(difference))
cpu.run()
print(score)
run_game()
21651