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day17.py
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import numpy as np
from scipy.ndimage.filters import convolve
from copy import deepcopy
def ascii2str(lst):
res = ''
for item in lst:
res += chr(item)
return res
# intcode computer function - from Day 9
def intcode_computer(input_command, program):
halt = False
cnt = 0
output_vals = []
relative_base = 0
cnt_inputs=0
while halt == False:
optcode = program[cnt]
if optcode%10 == 3:
pointer_increase = 2
input_val = input_command[cnt_inputs]
if str(optcode).zfill(2)[0] == '2':
program[program[cnt+1] + relative_base] = input_val
else:
program[program[cnt+1]] = input_val
cnt_inputs+=1
#print(cnt_inputs)
elif optcode%10 == 4:
pointer_increase = 2
if str(optcode).zfill(2)[0]=='1':
# immediate mode
output_vals.append(program[cnt+1])
elif str(optcode).zfill(2)[0]=='0':
# parameter mode
output_vals.append(program[program[cnt+1]])
elif str(optcode).zfill(2)[0]=='2':
# relative mode
#output_vals.append(program[cnt+1] + relative_base)
output_vals.append(program[program[cnt+1] + relative_base])
else:
print('bad mode ' + str(optcode).zfill(2)[0])
elif optcode%10 in (1, 2):
pointer_increase = 4
if str(optcode).zfill(5)[2]=='0':
first = program[program[cnt+1]]
elif str(optcode).zfill(5)[2]=='1':
first = program[cnt+1]
elif str(optcode).zfill(5)[2]=='2':
# relative mode
first = program[program[cnt+1] + relative_base]
else:
print('bad mode ' + str(optcode).zfill(4)[1])
if str(optcode).zfill(5)[1]=='0':
second = program[program[cnt+2]]
elif str(optcode).zfill(5)[1]=='1':
second = program[cnt+2]
elif str(optcode).zfill(5)[1]=='2':
# relative mode
second = program[program[cnt+2] + relative_base]
else:
print('bad mode ' + str(optcode).zfill(4)[0])
if optcode%10 == 1:
if str(optcode).zfill(5)[0]=='2':
program[program[cnt+3] + relative_base] = first+second
else:
program[program[cnt+3]] = first + second
else:
if str(optcode).zfill(5)[0]=='2':
program[program[cnt+3] + relative_base] = first*second
else:
program[program[cnt+3]] = first*second
# part 2:
elif optcode%10 in (5, 6, 7, 8):
if str(optcode).zfill(5)[2]=='0':
first = program[program[cnt+1]]
elif str(optcode).zfill(5)[2]=='1':
first = program[cnt+1]
elif str(optcode).zfill(5)[2]=='2':
first = program[program[cnt+1] + relative_base]
else:
print('bad mode ' + str(optcode).zfill(4)[1])
if str(optcode).zfill(5)[1]=='0':
second = program[program[cnt+2]]
elif str(optcode).zfill(5)[1]=='1':
second = program[cnt+2]
elif str(optcode).zfill(5)[1]=='2':
second = program[program[cnt+2] + relative_base]
else:
print('bad mode ' + str(optcode).zfill(4)[0])
if optcode%10 == 5:
if first!=0:
cnt = second
continue
else:
pointer_increase = 3
elif optcode%10 == 6:
if first==0:
cnt = second
continue
else:
pointer_increase = 3
elif optcode%10 == 7:
pointer_increase = 4
if first<second:
if str(optcode).zfill(5)[0]=='2':
program[program[cnt+3] + relative_base] = 1
else:
program[program[cnt+3]] = 1
else:
if str(optcode).zfill(5)[0]=='2':
program[program[cnt+3] + relative_base] = 0
else:
program[program[cnt+3]] = 0
else:
pointer_increase = 4
if first == second:
if str(optcode).zfill(5)[0]=='2':
program[program[cnt+3] + relative_base] = 1
else:
program[program[cnt+3]] = 1
else:
if str(optcode).zfill(5)[0]=='2':
program[program[cnt+3] + relative_base] = 0
else:
program[program[cnt+3]] = 0
elif optcode%10==9 and optcode !=99:
#relative_base += program[cnt+1]
pointer_increase = 2
if str(optcode).zfill(2)[0] == '2':
relative_base += program[program[cnt+1] + relative_base]
elif str(optcode).zfill(2)[0] == '1':
relative_base += program[cnt+1]
else:
relative_base += program[program[cnt+1]]
elif optcode == 99:
halt = True
else:
print('Bad opt code ' + str(optcode) + \
' at position ' + str(cnt))
break
cnt += pointer_increase
return output_vals, program
def draw_map(prog):
out_map = []
cur_line = ''
for item in prog:
if item == 35:
cur_line += '#'
elif item == 46:
cur_line += '.'
elif item == 60:
cur_line += '<'
elif item == 62:
cur_line += '>'
elif item == 94:
cur_line += '^'
elif item == 118:
cur_line += 'v'
elif item == 10:
out_map.append(cur_line)
cur_line = ''
else:
pass
return out_map[:-1]
def map2img(out_map):
img = np.zeros((len(out_map), len(out_map[0])))
for i in range(len(out_map)):
for j in range(len(out_map[0])):
if out_map[i][j] == '#':
img[i,j] = 1
else:
img[i,j] = 0
return img
f = open('input17.txt','r')
txt = f.read()
txt = txt.split('\n')
txt = txt[0].split(',')
puzzle_input = [int(a) for a in txt]
# increase memory:
puzzle_input += [0 for i in range(100000)]
# part 1:
output, program = intcode_computer([1], deepcopy(puzzle_input))
#print('part 1 output = ' + str(output))
out_map = draw_map(output)
# debug example - from question:
# out_map = ['..#..........',
# '..#..........',
# '#######...###',
# '#.#...#...#.#',
# '#############',
# '..#...#...#..',
# '..#####...^..']
bin_img = map2img(out_map)
# find intersections using filtering:
filt = np.array([[0, 1, 0],
[1, 1, 1],
[0,1, 0]])
filt = filt/np.sum(filt)
out_img = convolve(bin_img, filt)
xx,yy = np.where(out_img==1)
print('part 1 answer = ' + str(np.sum(xx*yy)))
# part 2:
puzzle_input[0]=2
def str2ascii(cmd):
res = []
for c in cmd:
res.append(ord(c))
return res
# I solved it manually by drawing the full path and discovering repeating patterns
# probably not as intended but this was my last puzzle and I'm tired...
full_path = 'L,12,R,4,R,4,R,12,R,4,L,12,R,12,R,4,L,12,R,12,R,4,L,6,L,8,L,8,R,12,R,4,L,6,L,8,L,8,L,12,R,4,R,4,L,12,R,4,R,4,R,12,R,4,L,12,R,12,R,4,L,12,R,12,R,4,L,6,L,8,L,8'
main_prog = 'A,B,B,C,C,A,A,B,B,C\n'
A_func = 'L,12,R,4,R,4\n'
B_func = 'R,12,R,4,L,12\n'
C_func = 'R,12,R,4,L,6,L,8,L,8\n'
yes_no = 'n\n'
cmd = main_prog + A_func + B_func + C_func + yes_no
inp = str2ascii(cmd)
output, program = intcode_computer(inp, deepcopy(puzzle_input))
print(f'part 2 answer = {output[-1]}')