Created
November 27, 2017 18:57
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Solution to Advent of Code 2016 Day 1
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import numpy as np | |
import pytest as t | |
import sys | |
TURN = { | |
'L': np.array([[0, 1], | |
[-1, 0]]), | |
'R': np.array([[0, -1], | |
[1, 0]]) | |
} | |
ORIGIN = np.array([0, 0]) | |
NORTH = np.array([0, 1]) | |
class Santa: | |
def __init__(self, location, heading): | |
self.location = np.array(location) | |
self.heading = np.array(heading) | |
def execute_one(self, instruction): | |
self.heading = self.heading @ TURN[instruction[0]] | |
self.location += self.heading * int(instruction[1:]) | |
def execute_many(self, instructions): | |
for i in instructions.split(','): | |
self.execute_one(i.strip()) | |
def distance_from_start(self): | |
return sum(abs(self.location)) | |
def __str__(self): | |
return f'Santa @ {self.location}, heading {self.heading}' | |
def test_execute_one(): | |
s = Santa(ORIGIN, NORTH) | |
s.execute_one('L1') | |
assert all(s.location == np.array([-1, 0])) | |
assert all(s.heading == np.array([-1, 0])) | |
s.execute_one('L3') | |
assert all(s.location == np.array([-1, -3])) | |
assert all(s.heading == np.array([0, -1])) | |
s.execute_one('R3') | |
assert all(s.location == np.array([-4, -3])) | |
assert all(s.heading == np.array([-1, 0])) | |
s.execute_one('R100') | |
assert all(s.location == np.array([-4, 97])) | |
assert all(s.heading == np.array([0, 1])) | |
def test_execute_many(): | |
s = Santa(ORIGIN, NORTH) | |
s.execute_many('L1, L3, R3') | |
assert all(s.location == np.array([-4, -3])) | |
assert all(s.heading == np.array([-1, 0])) | |
def test_distance(): | |
assert Santa(ORIGIN, NORTH).distance_from_start() == 0 | |
assert Santa((10, 10), NORTH).distance_from_start() == 20 | |
assert Santa((-17, 10), NORTH).distance_from_start() == 27 | |
def test_turn_left(): | |
east = NORTH @ TURN['L'] | |
south = east @ TURN['L'] | |
west = south @ TURN['L'] | |
assert all(east == np.array([-1, 0])) | |
assert all(south == np.array([0, -1])) | |
assert all(west == np.array([1, 0])) | |
def test_turn_right(): | |
west = NORTH @ TURN['R'] | |
south = west @ TURN['R'] | |
east = south @ TURN['R'] | |
assert all(east == np.array([-1, 0])) | |
assert all(south == np.array([0, -1])) | |
assert all(west == np.array([1, 0])) | |
if __name__ == '__main__': | |
instructions = sys.stdin.read() | |
santa = Santa(ORIGIN, NORTH) | |
santa.execute_many(instructions) | |
print(santa) | |
print(santa.distance_from_start()) |
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