Files
advent-of-code-2021/06/02.sh
2021-12-06 09:28:48 +01:00

22 lines
685 B
Bash
Executable File

#!/bin/bash
read line
anglerfishes=( ${line//,/ } )
new_anglerfishes=(0 0 0 0 0 0 0 0 0)
for i in $(seq ${#anglerfishes[@]}); do
new_anglerfishes[${anglerfishes[$((i-1))]}]=$((new_anglerfishes[anglerfishes[i-1]]+1))
done
anglerfishes=( "${new_anglerfishes[@]}" )
for i in $(seq 256); do
new_anglerfishes=(0 0 0 0 0 0 0 0 0)
for j in $(seq 2 9); do
new_anglerfishes[$((j-2))]=${anglerfishes[$((j-1))]}
done
new_anglerfishes[6]=$((anglerfishes[0]+new_anglerfishes[6]))
new_anglerfishes[8]=$((anglerfishes[0]+new_anglerfishes[8]))
anglerfishes=( "${new_anglerfishes[@]}" )
done
total_anglerfishes=$(sed 's/ /+/g' <<< "${anglerfishes[@]}")
echo $((total_anglerfishes))