From 6527698b9cff755063cc9ef2dfc5aa3df33c02a1 Mon Sep 17 00:00:00 2001 From: Felix Van der Jeugt Date: Fri, 3 Dec 2021 08:54:29 +0100 Subject: [PATCH] day 3 with hopeful counting for part 2 --- day03/part1.lua | 24 ++ day03/part2.lua | 33 ++ inputs/03.long | 1000 +++++++++++++++++++++++++++++++++++++++++++++++ inputs/03.short | 12 + 4 files changed, 1069 insertions(+) create mode 100644 day03/part1.lua create mode 100644 day03/part2.lua create mode 100644 inputs/03.long create mode 100644 inputs/03.short diff --git a/day03/part1.lua b/day03/part1.lua new file mode 100644 index 0000000..b635d6c --- /dev/null +++ b/day03/part1.lua @@ -0,0 +1,24 @@ +local ZERO = string.byte("0", 1) +local ONE = string.byte("1", 1) +local total = 0 +local counts = {} +for line in io.lines(arg[3]) do + for char = 1, #line do + if line:byte(char) == ONE then + counts[char] = (counts[char] or 0) + 1 + end + end + total = total + 1 +end + +local gamma, epsilon = 0, 0 +for i, count in ipairs(counts) do + gamma, epsilon = gamma * 2, epsilon * 2 + if count > total / 2 then + gamma = gamma + 1 + else + epsilon = epsilon + 1 + end +end + +print(gamma * epsilon) diff --git a/day03/part2.lua b/day03/part2.lua new file mode 100644 index 0000000..b557746 --- /dev/null +++ b/day03/part2.lua @@ -0,0 +1,33 @@ +local ZERO = string.byte("0", 1) +local ONE = string.byte("1", 1) +local total = 0 +local counts = {} +for line in io.lines(arg[3]) do + for char = 1, #line do + if line:byte(char) == ONE then + counts[char] = (counts[char] or 0) + 1 + end + end + total = total + 1 +end + +local least, most, lmax, mmax = nil, nil, 0, 0 +for line in io.lines(arg[3]) do + local lcur, mcur, lin, min = 0, 0, true, true + for char = 1, #line do + if line:byte(char) == ONE then + if counts[char] >= total / 2 then + if min then mcur = mcur + 1 end + else + min = false + end + else + if counts[char] < total / 2 then + if min then mcur = mcur + 1 end + else + min = false + end + end + end + print(line, mcur) +end diff 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