sharparam.com
Code for the Advent of Code event
aoc
advent-of-code
1local input = io.open("input.txt", "r")
2
3local map = {}
4
5local deliveries = 1
6
7local x = 0
8local y = 0
9
10map[x] = {}
11map[x][y] = true
12
13local char
14
15repeat
16 char = input:read(1)
17
18 if char == "^" then
19 y = y + 1
20 elseif char == "v" then
21 y = y - 1
22 elseif char == "<" then
23 x = x - 1
24 elseif char == ">" then
25 x = x + 1
26 end
27
28 if type(map[x]) ~= "table" then map[x] = {} end
29
30 if not map[x][y] then
31 deliveries = deliveries + 1
32 map[x][y] = true
33 end
34until not char
35
36print("Delivered at least once to " .. deliveries .. " houses")
37
38input:close()