day 6

src/6.input

@@ -0,0 +1,3 @@
+Time:        54     81     70     88
+Distance:   446   1292   1035   1007
+

src/6p1.lua

@@ -0,0 +1,43 @@
+require "llib"
+
+local inp = llib.io.readfile("6.input")
+
+local lines = {}
+for s in inp:gmatch("[^\r\n]+") do
+    table.insert(lines, s.." ")
+end
+
+local function get_row(ind)
+  local tfun = {}
+  local nnum = ""
+  for i=1,string.len(lines[ind]) do
+    local c = string.sub(lines[ind],i,i)
+    if c == ' ' then
+      if tonumber(nnum) ~= nil then
+        table.insert(tfun, tonumber(nnum))
+      end
+      nnum = ""
+    else
+      nnum = nnum .. c
+    end
+  end
+  return tfun
+end
+
+local times = get_row(1)
+local highscores = get_row(2)
+
+local total = 1
+for i=1,#times do
+  local better = 0
+  for z=1,times[i] - 1 do
+    if z*(times[i]-z) > highscores[i] then
+      better = better + 1
+    end
+  end
+
+  if better ~= 0 then
+    total = total * better
+  end
+end
+print(total)

src/6p2.lua

@@ -0,0 +1,40 @@
+require "llib"
+
+local inp = llib.io.readfile("6.input")
+
+local lines = {}
+for s in inp:gmatch("[^\r\n]+") do
+    table.insert(lines, s.." ")
+end
+
+local function get_row(ind)
+  local tfun = 0
+  local nnum = ""
+  for i=1,string.len(lines[ind]) do
+    local c = string.sub(lines[ind],i,i)
+    if c == ' ' then
+      if tonumber(nnum) ~= nil then
+        tfun = tfun * 10^string.len(nnum) + nnum
+      end
+      nnum = ""
+    else
+      nnum = nnum .. c
+    end
+  end
+  --print(tfun)
+  return tfun
+end
+
+local times = get_row(1)
+local highscores = get_row(2)
+
+--os.exit(0)
+local better = 0
+for z=1,times - 1 do
+    --print(z*(times[i]-z))
+  if z*(times-z) > highscores then
+    better = better + 1
+  end
+end
+
+print(better)