From 3555be54c2abb8d5ece008a60dbdfbde0ffbddd7 Mon Sep 17 00:00:00 2001
From: Alex Pickering <alex@cogarr.net>
Date: Fri, 7 Feb 2025 12:49:48 -0600
Subject: inital commit

---
 14/1.lua | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 14/1.lua

(limited to '14/1.lua')

diff --git a/14/1.lua b/14/1.lua
new file mode 100644
index 0000000..f774175
--- /dev/null
+++ b/14/1.lua
@@ -0,0 +1,83 @@
+require "ext"
+local cave = {}
+local lowest = 0
+for line in io.lines() do
+	print("line:",line)
+	local cursor = nil
+	for pair in line:gmatch("([0-9,]+)") do
+		local col,row  = pair:match("(%d+),(%d+)")
+		col,row = tonumber(col),tonumber(row)
+		if cursor then
+			for rown = math.min(cursor[1],row), math.max(cursor[1],row) do
+				for coln = math.min(cursor[2],col), math.max(cursor[2],col) do
+					cave[rown] = cave[rown] or {}
+					printf("Setting %d %d to true",rown,coln)
+					cave[rown][coln] = true
+				end
+			end
+		end
+		lowest = math.max(row,lowest)
+		cursor = {row,col}
+	end
+end
+
+local sand = {}
+function print_puzzle()
+	for row = 0, 500 do
+		for col = 0,100 do
+			local data = cave[row] and cave[row][col]
+			if data == "s" then
+				io.write("O")
+			elseif data then
+				io.write("#")
+			else
+				io.write(".")
+			end
+		end
+		io.write("\n")
+	end
+	for _,row in pairs(cave) do
+		for _,col in pairs(row) do
+		end
+	end
+end
+print_puzzle()
+print("lowest:",lowest)
+local floor = lowest + 2
+
+local sandpoint = {0,500}
+local movement = {
+	{1,0},
+	{1,-1},
+	{1,1}
+}
+local x = 0
+while true do
+	for k,v in pairs(sandpoint) do
+		sand[k] = v
+	end
+	local could_move = false
+	repeat
+		could_move = false
+		for _,move in ipairs(movement) do
+			local drow, dcol = sand[1] + move[1], sand[2] + move[2]
+			if not cave[drow] or cave[drow][dcol] == nil then
+				could_move = true
+				sand[1] = drow
+				sand[2] = dcol
+				break
+			end
+		end
+	until not could_move or sand[1] = floor 
+	if not could_move then
+		cave[sand[1]] = cave[sand[1]] or {}
+		cave[sand[1]][sand[2]] = "s"
+	end
+	if sand[1] == 500 then
+		print("sand stopped falling")
+		break
+	end
+	x = x + 1
+end
+print_puzzle()
+print(x)
-- 
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