comments

day2/part2.lua

@@ -98,6 +98,7 @@ local function is_safe(report)
 	return unsafe, unsafe_idx_1, unsafe_idx_2
 end
 
+-- Copy the report, remove the specified index, and test if it is safe
 local function test_altered_report(report, idx)
 	local test_report = table.shallow_copy(report)
 	table.remove(test_report, idx)
@@ -107,9 +108,11 @@ end
 
 local safe_count = 0
 for _, report in ipairs(reports) do
+	-- if unsafe == true, idx1 and idx2 will be null
 	local unsafe, idx1, idx2 = is_safe(report)
 
 	if unsafe then
+		-- if the report is unsafe, generate 2 reports with the potentially bad values removed, and test them again
 		if not test_altered_report(report, idx1) or not test_altered_report(report, idx2) then
 			unsafe = false
 		end
@@ -121,11 +124,3 @@ for _, report in ipairs(reports) do
 end
 
 print(safe_count)
-
-local function test()
-	return true, nil, nil
-end
-
-if test() then
-	print("uwu")
-end