283 lines
6.8 KiB
Python
283 lines
6.8 KiB
Python
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import sys
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sys.path.append('../aoclib')
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from aoclib import Input
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L = '<'
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U = '^'
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R = '>'
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D = 'v'
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STR_ROBOT = '@'
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STR_EMPTY = '.'
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STR_WALL = '#'
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STR_BOX = 'O'
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STR_BOX_L = '['
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STR_BOX_R = ']'
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class Map:
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def __init__(self, grid: list[list]):
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self.grid = grid
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def __str__(self):
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return '\n'.join(''.join(str(p) for p in line) for line in self.grid)
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def swap(self, x1, y1, x2, y2):
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self.grid[y1][x1], self.grid[y2][x2] = self.grid[y2][x2], self.grid[y1][x1]
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def type_is(self, x, y: int, obj):
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return type(self.grid[y][x]) == type(obj)
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def robot_pos(self):
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for y in range(len(self.grid)):
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for x in range(len(self.grid[0])):
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if self.type_is(x, y, Robot()):
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return x, y
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class Instruction:
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def __init__(self, s: str):
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self.dir = s
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def __str__(self):
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return self.dir
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def right(self) -> bool:
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return self.dir == R
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def left(self) -> bool:
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return self.dir == L
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def up(self) -> bool:
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return self.dir == U
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def down(self) -> bool:
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return self.dir == D
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class Point:
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def __init__(self, s=STR_EMPTY):
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self.s = s
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def __str__(self):
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return self.s
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class Robot(Point):
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def __init__(self, s=STR_ROBOT):
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super().__init__(s)
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class Box(Point):
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def __init__(self, s=STR_BOX, left=False):
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super().__init__(s)
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self.l = left
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def is_left(self) -> bool:
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return self.l
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class Wall(Point):
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def __init__(self, s=STR_WALL):
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super().__init__(s)
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class Solution:
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def __init__(self, m: Map, inst: list[Instruction]):
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self.m = m
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self.inst = inst
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def apply(self, cx, cy, ins: Instruction) -> bool:
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x, y = cx, cy
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if ins.up():
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y -= 1
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elif ins.down():
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y += 1
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elif ins.left():
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x -= 1
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elif ins.right():
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x += 1
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if self.m.type_is(x, y, Wall()):
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return False
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if self.m.type_is(x, y, Point()):
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self.m.swap(cx, cy, x, y)
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return True
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# we have a box
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if not self.apply(x, y, ins):
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return False
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self.m.swap(cx, cy, x, y)
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return True
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def apply_vert(self, cx, cy, ins: Instruction):
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x, y = cx, cy
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if ins.up():
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y -= 1
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elif ins.down():
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y += 1
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if self.m.type_is(x, y, Wall()):
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return
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if self.m.type_is(x, y, Point()):
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self.m.swap(cx, cy, x, y)
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return
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box = self.m.grid[y][x]
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if not self.move_box(x, y, box, ins):
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return
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self.move_box(x, y, box, ins, act=True)
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self.m.swap(cx, cy, x, y)
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def move_box(self, cx, cy, b: Box, ins: Instruction, act=False) -> bool:
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'''here comes the ugly part :) '''
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x1, y = cx, cy
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x2 = None
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if ins.up():
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y -= 1
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elif ins.down():
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y += 1
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if b.is_left():
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x2 = x1+1
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else:
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x2 = x1-1
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if self.m.type_is(x1, y, Point()) and self.m.type_is(x2, y, Point()):
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if act:
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self.m.swap(x1, cy, x1, y)
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self.m.swap(x2, cy, x2, y)
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return True
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if self.m.type_is(x1, y, Wall()) or self.m.type_is(x2, y, Wall()):
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return False
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m1, m2 = True, True
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if self.m.type_is(x1, y, Box()):
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box = self.m.grid[y][x1]
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m1 = self.move_box(x1, y, box, ins, act)
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if self.m.type_is(x2, y, Box()):
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box = self.m.grid[y][x2]
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m2 = self.move_box(x2, y, box, ins, act)
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if m1 and m2 and act:
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self.m.swap(x1, cy, x1, y)
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self.m.swap(x2, cy, x2, y)
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return m1 and m2
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def solve1(self):
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for ins in self.inst:
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x, y = self.m.robot_pos()
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self.apply(x, y, ins)
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s = 0
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for y in range(len(self.m.grid)):
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for x in range(len(self.m.grid[0])):
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if self.m.type_is(x, y, Box()):
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s += y*100 + x
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return s
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def solve2(self):
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for ins in self.inst:
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x, y = self.m.robot_pos()
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if ins.left() or ins.right():
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self.apply(x, y, ins)
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else:
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self.apply_vert(x, y, ins)
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s = 0
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for y in range(len(self.m.grid)):
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for x in range(len(self.m.grid[0])):
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if self.m.type_is(x, y, Box()) and self.m.grid[y][x].is_left():
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s += y*100 + x
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return s
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def parse_input(lines: list[str]):
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grid = []
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instructions = []
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for l in lines:
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if l.startswith(STR_WALL):
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grid.append(list(l))
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elif not l:
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continue
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else:
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instructions.extend(Instruction(s) for s in list(l))
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for y in range(len(grid)):
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for x in range(len(grid[0])):
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s = grid[y][x]
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obj = None
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if s == STR_WALL:
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obj = Wall()
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elif s == STR_BOX:
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obj = Box()
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elif s == STR_ROBOT:
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obj = Robot()
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else:
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obj = Point()
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grid[y][x] = obj
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m = Map(grid)
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return Solution(m, instructions)
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def parse_input2(lines: list[str]):
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grid = []
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instructions = []
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for l in lines:
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if l.startswith(STR_WALL):
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row = []
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for s in l:
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if s == STR_WALL:
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row.extend([s, s])
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elif s == STR_BOX:
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row.extend([STR_BOX_L, STR_BOX_R])
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elif s == STR_ROBOT:
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row.extend([s, STR_EMPTY])
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elif s == STR_EMPTY:
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row.extend([s, s])
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grid.append(row)
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elif not l:
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continue
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else:
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instructions.extend(Instruction(s) for s in list(l))
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for y in range(len(grid)):
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for x in range(len(grid[0])):
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s = grid[y][x]
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obj = None
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if s == STR_WALL:
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obj = Wall()
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elif s == STR_BOX_L:
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obj = Box(s, True)
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elif s == STR_BOX_R:
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obj = Box(s, False)
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elif s == STR_ROBOT:
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obj = Robot()
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else:
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obj = Point()
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grid[y][x] = obj
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m = Map(grid)
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return Solution(m, instructions)
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def solve1(lines: list[str]):
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s = parse_input(lines)
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return s.solve1()
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def solve2(lines: list[str]):
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s = parse_input2(lines)
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return s.solve2()
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if __name__ == '__main__':
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#lines = Input('input_test.txt').lines()
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lines = Input('input.txt').lines()
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#part 1
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print('part 1:', solve1(lines)) # 1456590
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#part 2
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print('part 2:', solve2(lines)) # 1489116
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