Day 16/part 1: bash version

day16/ex1.bash

@@ -0,0 +1,31 @@
+#!/bin/bash
+#
+# ex1.bash: Advent2020 game, day 15/games 1 and 2.
+
+CMD=${0##*/}
+#shopt -s extglob
+
+declare -A valid=()
+declare -i state=0 res=0
+
+while read -r line; do
+	if [[ $line =~ ^([a-z :]+)([0-9]+)-([0-9]+)([a-z ]+)([0-9]+)-([0-9]+)$ ]]; then
+		n1=$(seq "${BASH_REMATCH[2]}" "${BASH_REMATCH[3]}")
+		n2=$(seq "${BASH_REMATCH[5]}" "${BASH_REMATCH[6]}")
+		for i in $n1 $n2; do
+			valid[$i]=1
+		done
+	elif [[ $line =~ (your ticket:|nearby tickets) ]]; then
+		state=state+1
+	elif [[ $line != "" ]]; then
+		if ((state == 2)); then
+			for i in ${line//,/ }; do
+				[[ ! -v valid[$i] ]] && res=res+i
+			done
+		fi
+	fi
+done
+
+printf "%s : res=%d\n" "$CMD" "$res"
+
+exit 0