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Advent of Code
br0xen 40*
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Advent of Code
--- Day 8: Matchsticks ---
Space on the sleigh is limited this year, and so Santa will be bringing his list as a digital
copy. He needs to know how much space it will take up when stored.
Space on the sleigh is limited this year, and so Santa will be bringing his
list as a digital copy. He needs to know how much space it will take up when
stored.
It is common in many programming languages to provide a way to escape special characters in
strings. For example, C, JavaScript, Perl, Python, and even PHP handle special characters in
very similar ways.
It is common in many programming languages to provide a way to escape
special characters in strings. For example, C, JavaScript, Perl, Python, and
even PHP handle special characters in very similar ways.
However, it is important to realize the difference between the number of characters in the code
representation of the string literal and the number of characters in the in-memory string
itself.
However, it is important to realize the difference between the number of
characters in the code representation of the string literal and the number
of characters in the in-memory string itself.
For example:
• "" is 2 characters of code (the two double quotes), but the string contains zero
characters.
• "" is 2 characters of code (the two double quotes), but the string
contains zero characters.
• "abc" is 5 characters of code, but 3 characters in the string data.
• "aaa\"aaa" is 10 characters of code, but the string itself contains six "a" characters and
a single, escaped quote character, for a total of 7 characters in the string data.
• "\x27" is 6 characters of code, but the string itself contains just one - an apostrophe
('), escaped using hexadecimal notation.
Santa's list is a file that contains many double-quoted string literals, one on each line. The
only escape sequences used are \\ (which represents a single backslash), \" (which represents a
lone double-quote character), and \x plus two hexadecimal characters (which represents a single
character with that ASCII code).
• "aaa\"aaa" is 10 characters of code, but the string itself contains six
"a" characters and a single, escaped quote character, for a total of 7
characters in the string data.
Disregarding the whitespace in the file, what is the number of characters of code for string
literals minus the number of characters in memory for the values of the strings in total for
the entire file?
• "\x27" is 6 characters of code, but the string itself contains just one
- an apostrophe ('), escaped using hexadecimal notation.
For example, given the four strings above, the total number of characters of string code (2 + 5
+ 10 + 6 = 23) minus the total number of characters in memory for string values (0 + 3 + 7 + 1
= 11) is 23 - 11 = 12.
Santa's list is a file that contains many double-quoted string literals, one
on each line. The only escape sequences used are \\ (which represents a
single backslash), \" (which represents a lone double-quote character), and
\x plus two hexadecimal characters (which represents a single character with
that ASCII code).
Disregarding the whitespace in the file, what is the number of characters of
code for string literals minus the number of characters in memory for the
values of the strings in total for the entire file?
For example, given the four strings above, the total number of characters of
string code (2 + 5 + 10 + 6 = 23) minus the total number of characters in
memory for string values (0 + 3 + 7 + 1 = 11) is 23 - 11 = 12.
Your puzzle answer was 1350.
--- Part Two ---
Now, let's go the other way. In addition to finding the number of characters of code, you
should now encode each code representation as a new string and find the number of characters of
the new encoded representation, including the surrounding double quotes.
Now, let's go the other way. In addition to finding the number of characters
of code, you should now encode each code representation as a new string and
find the number of characters of the new encoded representation, including
the surrounding double quotes.
For example:
• "" encodes to "\"\"", an increase from 2 characters to 6.
• "abc" encodes to "\"abc\"", an increase from 5 characters to 9.
• "aaa\"aaa" encodes to "\"aaa\\\"aaa\"", an increase from 10 characters to 16.
• "aaa\"aaa" encodes to "\"aaa\\\"aaa\"", an increase from 10 characters
to 16.
• "\x27" encodes to "\"\\x27\"", an increase from 6 characters to 11.
Your task is to find the total number of characters to represent the newly encoded strings
minus the number of characters of code in each original string literal. For example, for the
strings above, the total encoded length (6 + 9 + 16 + 11 = 42) minus the characters in the
original code representation (23, just like in the first part of this puzzle) is 42 - 23 = 19.
Your task is to find the total number of characters to represent the newly
encoded strings minus the number of characters of code in each original
string literal. For example, for the strings above, the total encoded length
(6 + 9 + 16 + 11 = 42) minus the characters in the original code
representation (23, just like in the first part of this puzzle) is 42 - 23 =
19.
Your puzzle answer was 2085.
@@ -72,8 +77,6 @@
If you still want to see it, you can get your puzzle input.
You can also [Shareon Twitter Google+ Reddit] this puzzle.
References
Visible links
@@ -90,6 +93,3 @@ References
. http://php.net/manual/en/language.types.string.php#language.types.string.syntax.double
. http://adventofcode.com/
. http://adventofcode.com/day/8/input
. https://twitter.com/intent/tweet?text=I%27ve+completed+%22Matchsticks%22+%2D+Day+8+%2D+Advent+of+Code&url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F8&related=ericwastl&hashtags=AdventOfCode
. https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F8
. http://www.reddit.com/submit?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F8&title=I%27ve+completed+%22Matchsticks%22+%2D+Day+8+%2D+Advent+of+Code