From dcebd44260fa67b04d217e778265982393ccc032 Mon Sep 17 00:00:00 2001
From: Andreas Grois <andi@grois.info>
Date: Wed, 17 Dec 2025 07:30:19 +0100
Subject: Day4: Comment programs and export text version.

---
 day4/part1.TXT | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 day4/part1.TXT

(limited to 'day4/part1.TXT')

diff --git a/day4/part1.TXT b/day4/part1.TXT
new file mode 100644
index 0000000..31cdfdf
--- /dev/null
+++ b/day4/part1.TXT
@@ -0,0 +1,44 @@
+\START92\
+\COMMENT=Part1 Day4 s: parsed input, w: input width
+\NAME=part1
+\FILE=day4.part1.92f
+(s,w)
+Func
+Local h,i,j,curr,prevs,pc,result
+
+dim(s)\->\h
+If h<1 Then
+ Return 0
+ElseIf h=1 Then
+ Return cntbits(s[1])
+EndIf
+
+0\->\result
+For i,1,w
+ newList(3)\->\prevs
+ false\->\pc
+ For j,1,h
+  getbits(s[j],i-1,3)\->\curr
+  cnt3bits(curr)\->\prevs[mod(j,3)+1]
+  \(C)\'and' is not short circuiting
+  If pc Then
+   If sum(prevs)<5 Then
+    result+1\->\result
+   EndIf
+  EndIf
+  curr=2 or curr=3 or curr=6 or curr=7\->\pc
+ EndFor
+ \(C)\ last line
+ If pc Then
+  0\->\prevs[mod(h+1,3)+1]
+  If sum(prevs)<5 Then
+   result+1\->\result
+  EndIf
+ EndIf
+EndFor
+
+result
+
+EndFunc
+
+\STOP92\
-- 
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