33 lines
508 B
Bash
Executable File
33 lines
508 B
Bash
Executable File
#!/bin/bash
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#
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# ex1.bash: Advent2020 game, day 13/game 2.
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CMD=${0##*/}
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shopt -s extglob
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declare -a buses btimes
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declare -i lcm=1 thetime=0 c=0 t=0
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read -r line
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read -r line
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IFS=,
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for i in ${line}; do
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if [[ $i != x ]]; then
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buses[$c]=$i
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btimes[$c]=$t
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((c++))
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fi
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((t++))
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done
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for ((i=0; i<(${#buses[@]}-1); ++i)); do
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bus=${buses[i+1]}
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idx=${btimes[i+1]}
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((lcm*=buses[i]))
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while ((((thetime + idx) % bus) != 0)); do
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((thetime+=lcm))
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done
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done
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printf "%s : res=%d\n" "$CMD" "$thetime"
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exit 0
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