ninewise/adventofcode-2021
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add utils, use luajit which seems faster

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Felix Van der Jeugt 2021-12-05 12:10:59 +01:00
parent 87637a4682
commit fad5da2e27
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5 changed files with 33 additions and 25 deletions
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17
day05/part2.lua
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@ -1,3 +1,5 @@
require("utils")
function readline()
local x1 = io.read("*n")
io.read(1) -- ","
@ -16,24 +18,19 @@ function mark(field, x, y)
field[x] = row
end
function sign(n)
if n == 0 then return 0
elseif n < 0 then return -1
else return 1
end
end
local input = io.open(arg[3]):read("*a")
local lines = split(input, "\n")
io.input(arg[3])
local x1, y1, x2, y2 = readline()
local field = {}
while x1 ~= nil do
for _, line in pairs(lines) do
local x1, y1, x2, y2 = unpack(split(line, "[^0-9]+"))
x1, y1, x2, y2 = tonumber(x1), tonumber(y1), tonumber(x2), tonumber(y2)
local x, y, dx, dy = x1, y1, sign(x2 - x1), sign(y2 - y1)
mark(field, x, y)
while x ~= x2 or y ~= y2 do
x, y = x + dx, y + dy
mark(field, x, y)
end
x1, y1, x2, y2 = readline()
end
local count = 0