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aoc12.jl
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# -*- coding: utf-8 -*-
# ---
# jupyter:
# jupytext:
# formats: ipynb,jl:percent
# text_representation:
# extension: .jl
# format_name: percent
# format_version: '1.3'
# jupytext_version: 1.7.1
# kernelspec:
# display_name: Julia 1.5.2
# language: julia
# name: julia-1.5
# ---
# %%
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# %%
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F27";
# %%
Rot(θ)=[cosd(θ) -sind(θ); sind(θ) cosd(θ)] # counterclockwise rotation matrix
# remember that θ grows counterclockwise in a typical sin-cos circle
# %%
function sail(input)
start_pos = [0,0] # N, E
dir = [0, 1] # N, E
for action in split(input, '\n')
movement, number = action[1], parse(Int, action[2:end])
if movement == 'F'
start_pos += number*dir
elseif movement == 'N'
start_pos += number*[1, 0]
elseif movement == 'S'
start_pos += number*[-1, 0]
elseif movement == 'E'
start_pos += number*[0, 1]
elseif movement == 'W'
start_pos += number*[0, -1]
elseif movement == 'R'
dir = Rot(number)*dir
elseif movement == 'L'
dir = Rot(-number)*dir
end
end
print("Final direction ", dir, ". Final position: ", start_pos)
return sum(abs.(start_pos))
end
# %%
sail(ex1)
# %%
sail(input)
# %% [markdown]
# ## Part 2
# %%
function sail2(input)
start_pos = [0, 0] # N, E
waypoint = [1,10] # N, E
for action in split(input, '\n')
movement, number = action[1], parse(Int, action[2:end])
if movement == 'F'
start_pos += number*waypoint
elseif movement == 'N'
waypoint += number*[1, 0]
elseif movement == 'S'
waypoint += number*[-1, 0]
elseif movement == 'E'
waypoint += number*[0, 1]
elseif movement == 'W'
waypoint += number*[0, -1]
elseif movement == 'R'
waypoint = Rot(number)*waypoint
elseif movement == 'L'
waypoint = Rot(-number)*waypoint
end
end
print("Final waypoint ", waypoint, ". Final position: ", start_pos)
return sum(abs.(start_pos))
end
# %%
sail2(ex1)
# %%
sail2(input)
# %%