2020 day 6

2020/6/day6.lua

@@ -0,0 +1,29 @@
+#!/usr/bin/env lua
+local groups, current = {}, {count=0}
+for line in io.lines() do
+    if line == "" then
+        table.insert(groups, current)
+        current = {count=0}
+    else
+        for char in line:gmatch(".") do
+            current[char] = (current[char] or 0) + 1
+        end
+        current.count = current.count + 1
+    end
+end
+table.insert(groups, current)
+
+local any_count, all_count = 0, 0
+for _, group in ipairs(groups) do
+    for name, question_count in pairs(group) do
+        if name ~= "count" then
+            any_count = any_count + 1
+            if question_count == group.count then
+                all_count = all_count + 1
+            end
+        end
+    end
+end
+
+print(any_count)
+print(all_count)

README.md

@@ -11,7 +11,7 @@ My solutions to the Advent of Code puzzles.
  3 ██ ██ ██ ██    ██
  4 ██    ██ ██    ██
  5 ██    ██ ██    ██
- 6 ██    ██
+ 6 ██    ██       ██
  7 ██    ██
  8 ██    ██
  9 █     ██