Day 3



In [1]:

    
myinput = '/home/fmuinos/projects/adventofcode/2015/ferran/inputs/input3.txt'

Day 3.1



In [15]:

    
from collections import defaultdict

def move(pos, char):
    new0 = pos[0] - (char == '<') + (char == '>')
    new1 = pos[1] - (char == 'v') + (char == '^')
    return (new0, new1)



In [22]:

    
pos = (0,0)
visited = defaultdict(int)
visited[pos] += 1
with open(myinput, 'rt') as f:
    line = next(f).rstrip()
    for char in line:
        pos = move(pos, char)
        visited[pos] += 1
len(visited)









    Out[22]:





2565

Day 3.2



In [24]:

    
santa = (0,0)
robosanta = (0,0)
visited = defaultdict(int)
visited[santa] += 2
counter = 0
with open(myinput, 'rt') as f:
    line = next(f).rstrip()
    for char in line:
        if counter % 2 == 0:
            santa = move(santa, char)
            visited[santa] += 1
        else:
            robosanta = move(robosanta, char)
            visited[robosanta] += 1
        counter += 1
len(visited)









    Out[24]:





2639