Solution to Day 13: Packet Scanners - Part 2
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#aoc_d13.py | |
inp = ["0: 3","1: 2","4: 4","6: 4"] | |
inp = open('input_d13.txt','r').readlines() | |
data = [d.split(':') for d in inp] | |
dic = {} | |
data = dict(data) | |
maximum = int(max(data))+1 | |
direction = [1]*maximum | |
pos = [0]*maximum | |
def setup(): | |
for i in range(maximum): | |
if str(i) in data: | |
scanners[i] = [None]*int(data[str(i)]) | |
direction[i] = 1 | |
else: | |
scanners[i] = [None] | |
direction[i] = 0 | |
for i in range(maximum): | |
if scanners[i] != [None]: | |
scanners[i][0] = 'S' | |
def operate(pos, scanners, direction): | |
for k in range(len(pos)): | |
#print scanners,pos | |
scanners[k][pos[k]] = None | |
pos[k] += direction[k] | |
if pos[k] + direction[k] >= len(scanners[k]): | |
direction[k] *= -1 | |
elif pos[k] + direction[k] < 0: | |
direction[k] *= -1 | |
if scanners[k] != [None]: | |
#print 'upd for ',k,pos[k] | |
scanners[k][pos[k]] = 'S' | |
scanners = [None]*maximum | |
setup() | |
copy = scanners | |
caught = 0 | |
delay = 0 | |
max_scanner = 0 | |
last_executed = copy | |
last_directions = direction | |
last_pos = pos | |
print 'Len:',len(scanners) | |
while True: | |
caught = 0 | |
#scanners = copy | |
#direction = [1]*maximum | |
#pos = [0]*maximum | |
#setup() | |
#print 'delay', delay | |
if delay != 0: | |
scanners = list(last_executed) | |
direction = list(last_directions) | |
pos = list(last_pos) | |
#print 'bef:',delay,scanners | |
operate(pos, scanners, direction) | |
#print 'aft:',delay,scanners | |
last_executed = list(scanners) | |
last_directions = list(direction) | |
last_pos = list(pos) | |
#print 'delayed by: ',delay,scanners | |
for i in range(maximum): | |
if scanners[i][0] == 'S': | |
if max_scanner < i: | |
max_scanner = i | |
print 'max: ',max_scanner, 'delay: ',delay | |
#print 'have it on pos: ',i | |
caught = 1 | |
break | |
operate(pos, scanners, direction) | |
if caught == 0: | |
print delay | |
break | |
else: | |
delay += 1 | |
#if delay > 15: | |
# break | |
print delay | |
#print caught |
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