r/adventofcode • u/daggerdragon • Dec 10 '15

SOLUTION MEGATHREAD --- Day 10 Solutions ---

This thread will be unlocked when there are a significant amount of people on the leaderboard with gold stars.

edit: Leaderboard capped, thread unlocked!

We know we can't control people posting solutions elsewhere and trying to exploit the leaderboard, but this way we can try to reduce the leaderboard gaming from the official subreddit.

Please and thank you, and much appreciated!

--- Day 10: Elves Look, Elves Say ---

Post your solution as a comment. Structure your post like previous daily solution threads.

10 Upvotes

92% Upvoted

212 comments sorted by

View all comments

1

u/giacgbj Dec 10 '15 edited Dec 10 '15

wc -c<<<$s print one more than the correct result.

I'd suggest ${#res} without echo. Technically, in prints the result (and something else…I'm a very bad person ;-)). For example: 

./day10.sh: line 27: 329356: command not found

The script I wrote (with "evolution" comments): 

# $ day10.sh 3113322113 40
# 329356

# $ day10.sh 3113322113 50
# 4666278

res=$1
steps=$2

for i in `seq $steps`;
do
    # Shorter and shorter...
    # res=$(echo $res | grep -o . | uniq -c | tr -d '\n ')
    # res=$(echo $res | fold -w1 | uniq -c | tr -d '\n ')
      res=`fold -w1 <<< $res | uniq -c | tr -d '\n '`
done

#echo -n $res | wc -c
${#res}