41 lines
683 B
Bash
Executable File
41 lines
683 B
Bash
Executable File
#!/bin/bash
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#
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# ex2.bash: Advent2020 game, day 5/game 2.
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CMD=${0##*/}
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shopt -s extglob
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declare -a seats
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function rownum() {
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local val=${1%%???}
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val=${val//F/0}
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val=${val//B/1}
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echo $((2#$val))
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}
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function colnum() {
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local val=${1##???????}
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val=${val//L/0}
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val=${val//R/1}
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echo $((2#$val))
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}
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declare -i lines=0 max=0 row col res next
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while read -r line; do
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((lines++))
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row=$(rownum "$line")
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col=$(colnum "$line")
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res=$((row * 8 + col))
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seats[$res]=1
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#((max < res)) && max=$res
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#echo "row=$row col=$col res=$res"
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done
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for seat in ${!seats[@]}; do
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((next=seat+1))
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[[ -v seats[$next] ]] || break
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done
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printf "%s : lines=%d seat=%d\n" "$CMD" "$lines" "$next"
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exit 0
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