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## \-\-- Day 1: Not Quite Lisp \-\--
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Santa was hoping for a white Christmas, but his weather machine\'s
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\"snow\" function is powered by stars, and he\'s fresh out! To save
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Christmas, he needs you to collect *fifty stars* by December 25th.
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Collect stars by helping Santa solve puzzles. Two puzzles will be made
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available on each day in the Advent calendar; the second puzzle is
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unlocked when you complete the first. Each puzzle grants *one star*.
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[Good
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luck!]{title="Also, some puzzles contain Easter eggs like this one. Yes, I know it's not traditional to do Advent calendars for Easter."}
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Here\'s an easy puzzle to warm you up.
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Santa is trying to deliver presents in a large apartment building, but
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he can\'t find the right floor - the directions he got are a little
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confusing. He starts on the ground floor (floor `0`) and then follows
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the instructions one character at a time.
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An opening parenthesis, `(`, means he should go up one floor, and a
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closing parenthesis, `)`, means he should go down one floor.
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The apartment building is very tall, and the basement is very deep; he
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will never find the top or bottom floors.
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For example:
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- `(())` and `()()` both result in floor `0`.
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- `(((` and `(()(()(` both result in floor `3`.
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- `))(((((` also results in floor `3`.
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- `())` and `))(` both result in floor `-1` (the first basement
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level).
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- `)))` and `)())())` both result in floor `-3`.
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To *what floor* do the instructions take Santa?
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Your puzzle answer was `232`.
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## \-\-- Part Two \-\-- {#part2}
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Now, given the same instructions, find the *position* of the first
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character that causes him to enter the basement (floor `-1`). The first
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character in the instructions has position `1`, the second character has
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position `2`, and so on.
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For example:
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- `)` causes him to enter the basement at character position `1`.
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- `()())` causes him to enter the basement at character position `5`.
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What is the *position* of the character that causes Santa to first enter
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the basement?
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Your puzzle answer was `1783`.
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Both parts of this puzzle are complete! They provide two gold stars:
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\*\*
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At this point, you should [return to your Advent calendar](/2015) and
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try another puzzle.
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If you still want to see it, you can [get your puzzle
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input](1/input).
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<!DOCTYPE html>
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<html lang="en-us">
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<head>
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<meta charset="utf-8"/>
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<title>Day 1 - Advent of Code 2015</title>
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<link rel="stylesheet" type="text/css" href="/static/style.css?31"/>
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<link rel="stylesheet alternate" type="text/css" href="/static/highcontrast.css?1" title="High Contrast"/>
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<link rel="shortcut icon" href="/favicon.png"/>
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<script>window.addEventListener('click', function(e,s,r){if(e.target.nodeName==='CODE'&&e.detail===3){s=window.getSelection();s.removeAllRanges();r=document.createRange();r.selectNodeContents(e.target);s.addRange(r);}});</script>
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</head><!--
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Oh, hello! Funny seeing you here.
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I appreciate your enthusiasm, but you aren't going to find much down here.
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There certainly aren't clues to any of the puzzles. The best surprises don't
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even appear in the source until you unlock them for real.
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Please be careful with automated requests; I'm not a massive company, and I can
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only take so much traffic. Please be considerate so that everyone gets to play.
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If you're curious about how Advent of Code works, it's running on some custom
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Perl code. Other than a few integrations (auth, analytics, social media), I
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built the whole thing myself, including the design, animations, prose, and all
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of the puzzles.
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The puzzles are most of the work; preparing a new calendar and a new set of
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puzzles each year takes all of my free time for 4-5 months. A lot of effort
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went into building this thing - I hope you're enjoying playing it as much as I
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enjoyed making it for you!
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If you'd like to hang out, I'm @ericwastl@hachyderm.io on Mastodon and
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@ericwastl on Twitter.
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- Eric Wastl
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-->
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<body>
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<header><div><h1 class="title-global"><a href="/">Advent of Code</a></h1><nav><ul><li><a href="/2015/about">[About]</a></li><li><a href="/2015/events">[Events]</a></li><li><a href="https://teespring.com/stores/advent-of-code" target="_blank">[Shop]</a></li><li><a href="/2015/settings">[Settings]</a></li><li><a href="/2015/auth/logout">[Log Out]</a></li></ul></nav><div class="user">Frederik Baerentsen <span class="star-count">11*</span></div></div><div><h1 class="title-event"> <span class="title-event-wrap">$year=</span><a href="/2015">2015</a><span class="title-event-wrap">;</span></h1><nav><ul><li><a href="/2015">[Calendar]</a></li><li><a href="/2015/support">[AoC++]</a></li><li><a href="/2015/sponsors">[Sponsors]</a></li><li><a href="/2015/leaderboard">[Leaderboard]</a></li><li><a href="/2015/stats">[Stats]</a></li></ul></nav></div></header>
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<div id="sidebar">
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</div><!--/sidebar-->
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<main>
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<article><p>You don't seem to be solving the right level. Did you already complete it? <a href="/2015/day/1">[Return to Day 1]</a></p></article>
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</main>
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<!-- ga -->
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<script>
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(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
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(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
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m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
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})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
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ga('create', 'UA-69522494-1', 'auto');
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ga('set', 'anonymizeIp', true);
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ga('send', 'pageview');
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</script>
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<!-- /ga -->
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</body>
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</html>
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@@ -0,0 +1,17 @@
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#!/bin/python3
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import sys
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from pprint import pprint
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input_f = sys.argv[1]
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result = 0
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with open(input_f) as file:
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for line in file:
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for idx,i in enumerate(line):
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if i == '(':
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result += 1
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if i == ')':
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result -= 1
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print(result)
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## \-\-- Day 7: Some Assembly Required \-\--
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This year, Santa brought little Bobby Tables a set of wires and [bitwise
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logic gates](https://en.wikipedia.org/wiki/Bitwise_operation)!
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Unfortunately, little Bobby is a little under the recommended age range,
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and he needs help [assembling the
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circuit]{title="You had one of these as a kid, right?"}.
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Each wire has an identifier (some lowercase letters) and can carry a
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[16-bit](https://en.wikipedia.org/wiki/16-bit) signal (a number from `0`
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to `65535`). A signal is provided to each wire by a gate, another wire,
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or some specific value. Each wire can only get a signal from one source,
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but can provide its signal to multiple destinations. A gate provides no
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signal until all of its inputs have a signal.
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The included instructions booklet describes how to connect the parts
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together: `x AND y -> z` means to connect wires `x` and `y` to an AND
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gate, and then connect its output to wire `z`.
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For example:
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- `123 -> x` means that the signal `123` is provided to wire `x`.
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- `x AND y -> z` means that the [bitwise
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AND](https://en.wikipedia.org/wiki/Bitwise_operation#AND) of wire
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`x` and wire `y` is provided to wire `z`.
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- `p LSHIFT 2 -> q` means that the value from wire `p` is
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[left-shifted](https://en.wikipedia.org/wiki/Logical_shift) by `2`
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and then provided to wire `q`.
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- `NOT e -> f` means that the [bitwise
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complement](https://en.wikipedia.org/wiki/Bitwise_operation#NOT) of
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the value from wire `e` is provided to wire `f`.
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Other possible gates include `OR` ([bitwise
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OR](https://en.wikipedia.org/wiki/Bitwise_operation#OR)) and `RSHIFT`
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([right-shift](https://en.wikipedia.org/wiki/Logical_shift)). If, for
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some reason, you\'d like to *emulate* the circuit instead, almost all
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programming languages (for example,
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[C](https://en.wikipedia.org/wiki/Bitwise_operations_in_C),
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[JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators),
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or [Python](https://wiki.python.org/moin/BitwiseOperators)) provide
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operators for these gates.
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For example, here is a simple circuit:
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123 -> x
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456 -> y
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x AND y -> d
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x OR y -> e
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x LSHIFT 2 -> f
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y RSHIFT 2 -> g
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NOT x -> h
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NOT y -> i
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After it is run, these are the signals on the wires:
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d: 72
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e: 507
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f: 492
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g: 114
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h: 65412
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i: 65079
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x: 123
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y: 456
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In little Bobby\'s kit\'s instructions booklet (provided as your puzzle
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input), what signal is ultimately provided to *wire `a`*?
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To begin, [get your puzzle input](7/input).
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Answer:
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