67 lines
1.4 KiB
Bash
67 lines
1.4 KiB
Bash
#!/usr/bin/env bash
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read -r -a ROCK_LIST <<< "$( cat input )"
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BLINK_NUM=25
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ROCK_RETURN=()
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ROCK_NUM=0
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blink_rock () {
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#printf "Blinking rock : %s\n" "$ROCK_NUM" >&2
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# Remove leading zeroes
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ROCK_NUM=$(( 10#$ROCK_NUM ))
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# Rule 1 : Convert 0 to 1
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if [[ $ROCK_NUM -eq 0 ]]
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then
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ROCK_RETURN=( 1 )
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return
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fi
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# Rule 2 : If even number of digits, split half half
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DIGIT_COUNT=${#ROCK_NUM}
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if [[ $(( DIGIT_COUNT % 2 )) -eq 0 ]] && [[ $DIGIT_COUNT -gt 0 ]]
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then
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HALF=$(( DIGIT_COUNT / 2 ))
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read -r -a ROCK_RETURN <<< "$( printf "%s %s " "${ROCK_NUM:0:$HALF}" "${ROCK_NUM:$HALF}" )"
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return
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fi
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# Rule 3 : Multiply by 2024
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ROCK_RETURN=( $(( ROCK_NUM * 2024 )) )
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return
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}
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ROCKS_TO_BLINK=()
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BLINKED_ROCKS=()
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# Updates the global array
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blink_rocks () {
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BLINKED_ROCKS=()
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for ROCK in "${ROCKS_TO_BLINK[@]}"
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do
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ROCK_NUM=$ROCK
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blink_rock
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BLINKED_ROCKS+=( "${ROCK_RETURN[@]}" )
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done
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#printf "BLINKED_ROCKS: " >&2
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#printf "%s " "${BLINKED_ROCKS[@]}" >&2
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#printf "\n" >&2
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}
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FINAL_LIST=()
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for ROCK_NUM in "${ROCK_LIST[@]}"
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do
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printf "Rock: %s\n" "$ROCK_NUM"
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ROCKS_TO_BLINK=( "$ROCK_NUM" )
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for (( i=0 ; i< BLINK_NUM; i++ ))
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do
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blink_rocks
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ROCKS_TO_BLINK=( "${BLINKED_ROCKS[@]}" )
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done
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FINAL_LIST+=( "${BLINKED_ROCKS[@]}" )
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done
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printf "%s " "${FINAL_LIST[@]}"
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printf "\n"
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printf "%s\n" "${#FINAL_LIST[@]}"
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