2022 day 3 part 1 (bash)

2022/day03/aoc.bash

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+#
+# aoc.bash: Advent of Code 2022, day 2
+#
+# Copyright (C) 2022 Bruno Raoult ("br")
+# Licensed under the GNU General Public License v3.0 or later.
+# Some rights reserved. See COPYING.
+#
+# You should have received a copy of the GNU General Public License along with this
+# program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+#
+# SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+
+. common.bash
+
+export LANG=C
+declare -a tot=(1 2)
+
+# get priority value for an item
+# $1: character
+prio() {
+    local -n _val="$1"
+    local _char="$2"
+
+    printf -v _val "%d" "'$_char"
+    if [[ $_char > "Z" ]]; then                   # a-z
+        ((_val += (1 - 97) ))
+    else                                          # A-Z
+        ((_val += (27 - 65) ))
+    fi
+}
+
+parse() {
+    local input half1 half2 result=""
+    local -i len half i j=1 prio part1=0 line=1
+
+    while read -r input; do
+        (( len = ${#input}, half = len/2 ))
+        half1="${input:0:half}"
+        half2="${input:half}"
+        result=""
+
+        #printf "[%d] l=%d h=%d [%s / %s]\n" "$line" "$len" "$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}"
+                (( part1 += prio ))
+                #printf "%d prio(%c)=%d tot=%d\n" "$line" "$c" "$prio" "$part1"
+            fi
+        done
+        ((j++, line++))
+        echo
+    done
+    echo "result=$part1"
+}
+
+solve() {
+    res="${tot[$1]}"
+}
+
+main "$@"
+exit 0