From 0a32d9ff56cdf0f2a669c21d7743b21ad72fe8f6 Mon Sep 17 00:00:00 2001
From: Michael Hunteman <michael@huntm.net>
Date: Tue, 7 Mar 2023 10:52:31 -0600
Subject: Add 3

---
 3 | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100755 3

diff --git a/3 b/3
new file mode 100755
index 0000000..bf416b6
--- /dev/null
+++ b/3
@@ -0,0 +1,48 @@
+#!/bin/sh -eu
+find_uniq() (
+	printf "$1" | fold -w 1 | sort -u | tr -d '\n'
+)
+
+find_dup() (
+	printf "$1" | fold -w 1 | sort | uniq -d
+)
+
+prioritize() (
+	ord=$1
+	if [ $ord -lt 97 ]
+	then
+		p=$((ord - 38))
+	else
+		p=$((ord - 96))
+	fi
+	printf "$p"
+)
+
+p1() (
+	sum=0
+	while IFS= read -r l
+	do
+		c1=$(find_uniq $(printf "$l" | cut -c-$((${#l} / 2))))
+		c2=$(find_uniq $(printf "$l" | cut -c$((${#l} / 2 + 1))-))
+		dup=$(find_dup "${c1}${c2}")
+		sum=$((sum + $(prioritize $(printf "%d\n" "'$dup"))))
+	done < input.txt
+	printf "%s\n" "$sum"
+)
+
+p2() (
+	sum=0
+	while IFS= read -r r1; IFS= read -r r2; IFS= read -r r3
+	do
+		r1=$(find_uniq "$r1")
+		r2=$(find_uniq "$r2")
+		r3=$(find_uniq "$r3")
+		dup=$(find_dup "${r1}${r2}")
+		dup=$(find_dup "${dup}${r3}")
+		sum=$((sum + $(prioritize $(printf "%d\n" "'$dup"))))
+	done < input.txt
+	printf "%s\n" "$sum"
+)
+
+p1
+p2
-- 
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