From 05286f41ce90a83ee7ed5c332651e0e1846c56ce Mon Sep 17 00:00:00 2001
From: Michael Hunteman <michael@huntm.net>
Date: Wed, 3 May 2023 17:58:30 -0500
Subject: Add 4

---
 4 | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100755 4

diff --git a/4 b/4
new file mode 100755
index 0000000..92a653b
--- /dev/null
+++ b/4
@@ -0,0 +1,39 @@
+#!/bin/sh -eu
+p1() (
+	sum=0
+	while IFS= read -r l
+	do
+		r1=$(printf "$l" | cut -d',' -f1)
+		r2=$(printf "$l" | cut -d',' -f2)
+		x1=$(printf "$r1" | cut -d'-' -f1)
+		y1=$(printf "$r1" | cut -d'-' -f2)
+		x2=$(printf "$r2" | cut -d'-' -f1)
+		y2=$(printf "$r2" | cut -d'-' -f2)
+		if ([ $x1 -le $x2 ] && [ $y1 -ge $y2 ]) || ([ $x2 -le $x1 ] && [ $y2 -ge $y1 ])
+		then
+			sum=$((sum + 1))
+		fi
+	done < input.txt
+	printf "%s\n" "$sum"
+)
+
+p2() (
+	sum=0
+	while IFS= read -r l
+	do
+		r1=$(printf "$l" | cut -d',' -f1)
+		r2=$(printf "$l" | cut -d',' -f2)
+		x1=$(printf "$r1" | cut -d'-' -f1)
+		y1=$(printf "$r1" | cut -d'-' -f2)
+		x2=$(printf "$r2" | cut -d'-' -f1)
+		y2=$(printf "$r2" | cut -d'-' -f2)
+		if ([ $y1 -ge $x2 ] && [ $x1 -le $y2 ]) || ([ $y2 -ge $x1 ] && [ $x2 -le $y1 ])
+		then
+			sum=$((sum + 1))
+		fi
+	done < input.txt
+	printf "%s\n" "$sum"
+)
+
+p1
+p2
-- 
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