1.sh


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#!/usr/bin/env bash

function smallest {
	local -n arr=$1
	smallest=${arr[0]}
	for i in "${!arr[@]}"; do
		[[ -n ${arr[i]} ]] || continue
		[[ ${arr[i]} -lt $smallest ]] && smallest=${arr[i]}
	done
	echo "$smallest"
}

function delete_a {
	local value=$1 deleted=false new_arr=()
	local -n arr=$2
	for i in "${arr[@]}"; do
		[[ $deleted == true ]] && new_arr+=($i) && continue
		[[ $i -ne $value ]] && new_arr+=($i) && continue
		deleted=true
	done
	echo "${new_arr[@]}"
}

function occurences {
	local value=$1 count=0
	local -n arr=$2
	for i in "${arr[@]}"; do
		[[ $i -eq $value ]] && count=$((count + 1))
	done
	echo "$count"
}

one=()
two=()
total_distance=0
total_count=0

while read -r line; do
	one+=("${line%% *}")
	two+=("${line##* }")
done <./1-input.txt

for i in $(seq 0 $((${#one[@]} - 1))); do
	n="${one[i]}"
	total_count=$((total_count + n * $(occurences "$n" two)))
done

for i in $(seq 1 ${#one[@]}); do
	smallest_one=$(smallest one)
	smallest_two=$(smallest two)
	one=($(delete_a $smallest_one one))
	two=($(delete_a $smallest_two two))
	distance=$((smallest_one - smallest_two))
	if [[ $distance -lt 0 ]]; then
		distance=$((distance * -1))
	fi
	total_distance=$((total_distance + distance))
done

echo "puzzle 1: $total_distance"
echo "puzzle 2: $total_count"

# puzzle 1: 2285373
# puzzle 2: 21142653