3 files changed, 1410 insertions(+), 1 deletions(-)

A 2023/13.lua
A 2023/13.txt
M 2023/Makefile

@@ 0,0 1,54 @@
+local function transpose(grid, width)
+	local new = {}
+	for x = 1, width do
+		local col = 0
+		for y = 1, #grid do
+			col = col << 1 | (grid[y] >> width - x) & 1
+		end
+		new[x] = col
+	end
+	return new
+end
+local function reflect(grid)
+	local i1, i2 = 0, 0
+	for i = 1, #grid - 1 do
+		local diff, smudge
+		for j = 1, math.min(#grid - i, i) do
+			local bits = grid[i - j + 1] ~ grid[i + j]
+			if bits ~= 0 then
+				if smudge or bits & bits - 1 ~= 0 then
+					diff = true
+					break
+				end
+				smudge = true
+			end
+		end
+		if not diff then
+			if smudge then i2 = i else i1 = i end
+		end
+	end
+	return i1, i2
+end
+
+local ans1, ans2, rock = 0, 0, string.byte'#'
+repeat
+	local grid, done, width = {}, true
+	for line in io.lines() do
+		if #line == 0 then done = false break end
+		if not width then width = #line end
+		local row = 0
+		for x = 1, #line do
+			row = row << 1 | (string.byte(line, x) == rock and 1 or 0)
+		end
+		table.insert(grid, row)
+	end
+	local r1, r2 = reflect(grid)
+	ans1 = ans1 + r1 * 100
+	ans2 = ans2 + r2 * 100
+	if r1 == 0 or r2 == 0 then
+		local c1, c2 = reflect(transpose(grid, width))
+		ans1 = ans1 + c1
+		ans2 = ans2 + c2
+	end
+until done
+print(ans1, ans2)

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@@ 4,7 4,7 @@
 LUA?=lua
 
 .PHONY: all
-all: 1 2 3 4 5 6 7 9 10 11
+all: 1 2 3 4 5 6 7 9 10 11 13
 
 .DEFAULT:
 	@printf 'day %s\t' $< && $(LUA) $<.lua < $<.txt