rename repo, subdir for yearly challenges

2020/day08/ex1.bash

@@ -0,0 +1,58 @@
+#!/bin/bash
+#
+# ex1.bash: Advent2020 game, day 8/game 1.
+
+CMD=${0##*/}
+shopt -s extglob
+
+#declare -i ACCUMULATOR=0
+
+declare -a PRG=()
+declare -i ARG=()
+declare -i PRGSIZE=0
+
+function run() {
+	local -i arg cur=0 res=0
+	local -a steps=()
+	local instr
+
+	while [[ ${steps[$cur]} != 1 ]]; do
+		instr=${PRG[$cur]}
+		arg=${ARG[$cur]}
+		steps[$cur]=1
+		case "$instr" in
+			acc)
+				((res += arg))
+				((cur++))
+				;;
+			nop)
+				((cur++))
+				;;
+			jmp)
+				((cur += arg))
+				;;
+		esac
+	done
+	echo "$res"
+}
+
+function print_prog()
+{
+	local -i i
+	for ((i=0; i<PRGSIZE; ++i)); do
+		printf "%03d : [%s][%3d]\n" "$i" "${PRG[$i]}" "${ARG[$i]}"
+	done
+}
+
+while read -r instr arg; do
+	PRG[$PRGSIZE]=$instr
+	ARG[$PRGSIZE]=$arg
+	((PRGSIZE++))
+done
+
+#print_prog
+
+res=$(run)
+printf "%s : res=%d\n" "${CMD}" "$res"
+
+exit 0