76 lines
1.5 KiB
Lua
Executable File
76 lines
1.5 KiB
Lua
Executable File
#!/usr/bin/lua
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-- See https://adventofcode.com/2025/day/3
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local DEBUG = false
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function debug(msg)
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if DEBUG then
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print(msg)
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end
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end
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function MaxJolt(Battery)
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local b = {}
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local firstdigit = 0
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local seconddigit = 0
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local maxdigit = 0
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lastdigit = tonumber(string.sub(Battery, -1))
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debug("lastdigit " .. lastdigit)
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BatteryNoLast = string.sub(Battery, 0, -2)
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BatteryNoLast:gsub(".", function(c)
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table.insert(b, c)
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return c
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end)
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for key, value in pairs(b) do
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checkdigit = tonumber(value)
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if firstdigit < checkdigit then
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firstdigit = checkdigit
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end
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end
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local passedfirst = false
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for key, value in pairs(b) do
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checkdigit = tonumber(value)
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if passedfirst and seconddigit < checkdigit then
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seconddigit = checkdigit
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end
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if checkdigit == firstdigit then
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passedfirst = true
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end
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end
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if seconddigit < lastdigit then
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seconddigit = lastdigit
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end
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debug("First " .. firstdigit)
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debug("Second " .. seconddigit)
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return tostring(firstdigit) .. tostring(seconddigit)
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end
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function TestMaxJolt(Battery, Test)
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local MJ = MaxJolt(Battery)
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if MJ == Test then
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print("WIN - " .. Battery .. " " .. MJ .. " == " .. Test)
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else
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print("FAIL - " .. Battery .. " " .. MJ .. " != " .. Test)
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end
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end
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print("# Self Test")
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TestMaxJolt("987654321111111", "98")
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TestMaxJolt("811111111111119", "89")
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TestMaxJolt("234234234234278", "78")
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TestMaxJolt("818181911112111", "92")
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print("# Calculate MaxJolt")
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local TotalJolt = 0
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for battery_line in io.lines("full_input") do
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TotalJolt = TotalJolt + MaxJolt(battery_line)
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end
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print("Total " .. TotalJolt)
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