43 lines
826 B
Bash
Executable File
43 lines
826 B
Bash
Executable File
#!/bin/bash
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#
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# ex1.bash: Advent2020 game, day 24/game 1.
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CMD=${0##*/}
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shopt -s extglob
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set -o noglob
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declare -A plan
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declare -i x y
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while read -r line; do
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x=0
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y=0
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for ((i=0; i<${#line}; ++i)); do
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c=${line:i:1}
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case "$c" in
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e) ((++x))
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;;
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w) ((--x))
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;;
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s) ((--y, ++i))
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c=${line:i:1}
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;;
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n) ((++y, ++i))
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c=${line:i:1}
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;;
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esac
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if [[ "$c" = e ]]; then
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((++x))
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elif [[ "$c" = w ]]; then
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((--x))
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else
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printf "error c=%s\n" "$c"
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exit 1
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fi
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done
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[[ -v plan[$x,$y] ]] && unset "plan[$x,$y]" || plan[$x,$y]=1
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done
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res=${#plan[@]}
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printf "%s: res=%s\n" "$CMD" "$res"
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exit 0
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