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base: tommy:4b9196370a7408e46b7deff3f237de07f98aecf4
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tommy:main/2024
..
compare: tommy:2ce473c58d190fc115475db0649a4e10f201d40a
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tommy:main/2024

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3 changed files with 0 additions and 1109 deletions
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42
day2/day2_part1.lua
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@ -1,42 +0,0 @@
--Lua 5.4.2
local File = io.open("input.txt", "r")
if not File then
print("File not found")
return
end
local SafeReports = 0
for Line in File:lines() do
local IsSafe = true
local LastSign = 0
local LastNumber
for Number in Line:gmatch("%d+") do
if not LastNumber then
LastNumber = Number
goto continue
end
local Difference = math.abs(Number - LastNumber)
if Difference > 3 or Difference == 0 then
IsSafe = false
break
end
local Sign = (Number - LastNumber) > 0 and 1 or -1
if LastSign == 0 then
LastSign = Sign
else
if Sign ~= LastSign then
IsSafe = false
break
end
end
LastNumber = Number
::continue::
end
if IsSafe then
SafeReports = SafeReports + 1
end
end
print("Safe reports:", SafeReports)

67
day2/day2_part2.lua
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@ -1,67 +0,0 @@
--Lua 5.4.2
local File = io.open("input.txt", "r")
if not File then
print("File not found")
return
end
local function IsReportSafe(Numbers)
local IsSafe = true
local LastSign = 0
local LastNumber
for _, Number in next, Numbers do
if not LastNumber then
LastNumber = Number
goto continue
end
local Difference = math.abs(Number - LastNumber)
if Difference > 3 or Difference == 0 then
IsSafe = false
break
end
local Sign = (Number - LastNumber) > 0 and 1 or -1
if LastSign == 0 then
LastSign = Sign
else
if Sign ~= LastSign then
IsSafe = false
break
end
end
LastNumber = Number
::continue::
end
return IsSafe
end
local function Clone(t) --surface level copy
local Cloned = {}
for Key, Value in next, t do
Cloned[Key] = Value
end
return Cloned
end
local SafeReports = 0
for Line in File:lines() do
local Numbers = {}
for Number in Line:gmatch("%d+") do
table.insert(Numbers, tonumber(Number))
end
if IsReportSafe(Numbers) then
SafeReports = SafeReports + 1
else
for Index = 1, #Numbers do
local NumbersCopy = Clone(Numbers) --yikes
table.remove(NumbersCopy, Index)
if IsReportSafe(NumbersCopy) then
SafeReports = SafeReports + 1
break
end
end
end
end
print("Safe reports:", SafeReports)

1000
day2/input.txt
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