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HEAD
Day 13 (start)
[advent-of-code-2021.git]
/
day07
/
crabs.sh
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#!/bin/bash
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set -u
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filename="${1:-example.txt}"
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exec 3<"$filename"
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OLDIFS="$IFS"
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IFS=","
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read -u 3 -a crabs
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IFS=$'\n'
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crabs=($(sort -n <<<"${crabs[*]}"))
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mid_point=$((${#crabs[@]} / 2))
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mid_val=${crabs[$mid_point]}
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fuel=0
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for (( a=0; a<${#crabs[@]}; a++ )); do
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diff=$((mid_val-${crabs[$a]}))
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diff=${diff#-}
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((fuel+=$diff))
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done
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echo "Fuel needed: $fuel"