bash: 2022 day 3 (final 2 parts)

2022/day03/aoc.bash

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# aoc.bash: Advent of Code 2022, day 2
+# aoc.bash: Advent of Code 2022, day 3
 #
 # Copyright (C) 2022 Bruno Raoult ("br")
 # Licensed under the GNU General Public License v3.0 or later.
@@ -14,14 +14,14 @@
 . common.bash
 
 export LANG=C
-declare -a tot=(1 2)
 declare -a input
 
-# get priority value for an item
-# $1: character
+# prio - get priority value for an item
+# $1: reference of variable for result
+# $2: string
 prio() {
     local -n _val="$1"
-    local _char="$2"
+    local _char="${2:0:1}"
 
     printf -v _val "%d" "'$_char"
     if [[ $_char > "Z" ]]; then                   # a-z
@@ -31,63 +31,46 @@ prio() {
     fi
 }
 
+# common=chars - get common characters in two strings
+# $1: reference of variable for result
+# $2, $3: The two strings
+common_chars() {
+    local -n _res="$1"
+
+    _res="${2//[^$3]}"
+}
+
 parse() {
     readarray -t input
 }
 
 part1() {
-    local line half1 half2 result=""
-    local -i len half i prio
+    local line half1 half2 common
+    local -i half i prio
+    declare -ig res=0
 
-    res=0
     for line in "${input[@]}"; do
-        echo "$line"
-        (( len = ${#line}, half = len/2 ))
+        (( half = ${#line} / 2 ))
         half1="${line:0:half}"
         half2="${line:half}"
-        result=""
-
-        printf "[%d] l=%d h=%d [%s / %s]\n" "$num" "$len" "$half" "$half1" "$half2"
-
-        #c="${half1//[^${half2}]}"
-        #prio prio "${c:0:1}"
-        #(( part1 += prio ))
-
-        for (( i = 0; i < half; ++i )); do
-            c=${half1:$i:1}
-            if [[ $result != *$c* && $half2 == *$c* ]]; then
-                echo "found $c"
-                result=$result$c
-                prio prio "${c:0:1}"
+        common="${half1//[^${half2}]}"
+        prio prio "${common}"
         (( res += prio ))
-                #printf "%d prio(%c)=%d tot=%d\n" "$line" "$c" "$prio" "$part1"
-            fi
-        done
     done
 }
 
 part2() {
-    local common one two three
-    local -i len half i prio
+    local one two three common
+    local -i i prio
+    declare -ig res=0
 
-    res=0
     for (( i = ${#input[@]} - 1; i > 1; i -= 3)); do
         three=${input[i]}
         two=${input[i - 1]}
         one=${input[i - 2]}
-        common=${three//[^${two}]}
-        common=${common//[^${one}]}
-        #common=${}
-        #echo "$line"
-        #(( len = ${#line}, half = len/2 ))
-        #half1="${line:0:half}"
-        #half2="${line:half}"
-        #result=""
-
-        printf "[%d] 1=%s 2=%s 3=%s c=%s\n" "$i" "$one" "$two" "$three" "$common"
-
-        #c="${half1//[^${half2}]}"
-        prio prio "${common:0:1}"
+        common_chars common "$three" "$two"
+        common_chars common "$common" "$one"
+        prio prio "${common}"
         (( res += prio ))
     done
 }
@@ -98,7 +81,6 @@ solve() {
     else
         part2
     fi
-    #res="${tot[$1]}"
 }
 
 main "$@"