43 lines
836 B
Lua
43 lines
836 B
Lua
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function find_same(first, second, third)
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for c in first:gmatch('.') do
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if string.find(second, c) ~= nil and string.find(third, c) ~= nil then
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return c
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end
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end
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end
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function priority(char)
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dec = string.byte(char)
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if dec & 0x20 == 0 then
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-- Uppercase
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return dec - string.byte('A') + 27
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else
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-- Lowercase
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return dec - string.byte('a') + 1
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end
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end
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file = io.open('input')
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sacks = {}
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for line in file:lines() do
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table.insert(sacks, line)
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end
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total = 0
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for i = 1, math.floor(#sacks / 3) do
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local i0 = i - 1
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local first = sacks[i0 * 3 + 1]
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local second = sacks[i0 * 3 + 2]
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local third = sacks[i0 * 3 + 3]
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local same = find_same(first, second, third)
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total = total + priority(same)
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print(same, total)
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end
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print(total)
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