68 lines
1.4 KiB
Lua
Executable File
68 lines
1.4 KiB
Lua
Executable File
#!/usr/bin/env lua
|
|
|
|
function file_exists(file)
|
|
local f = io.open(file, "rb")
|
|
if f then f:close() end
|
|
return f ~= nil
|
|
end
|
|
|
|
-- get all lines from a file, returns an empty
|
|
-- list/table if the file does not exist
|
|
function lines_from(file)
|
|
if not file_exists(file) then return {} end
|
|
lines = {}
|
|
for line in io.lines(file) do
|
|
lines[#lines + 1] = line
|
|
end
|
|
return lines
|
|
end
|
|
|
|
function atoi_list(strings)
|
|
local ints = {}
|
|
for i,s in ipairs(strings) do
|
|
ints[#ints + 1] = tonumber(s)
|
|
end
|
|
return ints
|
|
end
|
|
|
|
function toSlices(ints)
|
|
local slices = {}
|
|
for k,i in ipairs(ints) do
|
|
if(k < (#ints - 1)) then
|
|
slices[k] = ints[k] + ints[k+1] + ints[k+2]
|
|
end
|
|
end
|
|
return slices
|
|
end
|
|
|
|
function split(s, delimiter)
|
|
result = {};
|
|
for match in (s..delimiter):gmatch("(.-)"..delimiter) do
|
|
table.insert(result, match);
|
|
end
|
|
return result;
|
|
end
|
|
|
|
-------------------------------------------------
|
|
file = "input.txt"
|
|
|
|
local sums = {}
|
|
sums["up"] = 0
|
|
sums["down"] = 0
|
|
sums["forward"] = 0
|
|
|
|
allLines = lines_from(file)
|
|
|
|
for i,l in ipairs(allLines) do
|
|
local current = split(l, ' ')
|
|
local cmd = current[1]
|
|
sums[cmd] = sums[cmd] + current[2]
|
|
end
|
|
|
|
local v = sums["down"] - sums["up"]
|
|
print("vertical position: " .. v)
|
|
|
|
local result = v * sums["forward"]
|
|
|
|
io.write("The answer is ", result, ". Congrats, I hope!\n")
|