Initial commit.

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Brandon Scott 2017-06-26 20:19:55 -05:00
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Individual files may be licensed differently, as noted in those files.
MIT License
Copyright (c) 2016 individual contributors
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# Advent of Code 2016
## About
These are my solutions to the Advent of Code 2016.
## License
By default, all code in this project is licensed under the MIT license,
copyright the individual contributor(s). Comments in individual files
may specify an alternate license as chosen by a particular individual
for their code. If not specified, the file is MIT.

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/*
* Advent of Code 2016
* Day 1 (part 1)
*/
using System;
using System.Collections.Generic;
namespace adventofcode
{
enum Direction
{
North,
East,
South,
West
}
enum Side
{
Left = 'L',
Right = 'R'
}
class Instruction
{
public Side Side { get; set; }
public int StepCount { get; set; }
public Instruction(Side side, int stepCount)
{
this.Side = side;
this.StepCount = stepCount;
}
}
class Point
{
public int X { get; set; }
public int Y { get; set; }
public Point(int x, int y)
{
this.X = x;
this.Y = y;
}
}
class bscott01
{
List<Instruction> instructions = new List<Instruction>();
public void ClearInstructions()
{
instructions.Clear();
}
public bool LoadInstructions(string input)
{
if (input.Length == 0)
return false;
foreach (string s in input.Split(new char[] { ',' }))
{
string instruction = s.Trim().ToUpper();
// Not a valid instruction length
if (instruction.Length < 2)
continue;
// Not a valid side
if (instruction[0] != 'L' && instruction[0] != 'R')
continue;
Side side = (Side)instruction[0];
int stepCount = 0;
if(!int.TryParse(instruction.Substring(1), out stepCount))
continue;
instructions.Add(new Instruction(side, stepCount));
}
return instructions.Count > 0;
}
public int GetDistanceA()
{
int currentX = 0, currentY = 0;
Direction currentDirection = Direction.North;
foreach (Instruction instruction in instructions)
{
if (instruction.Side == Side.Left)
currentDirection = (int)currentDirection - 1 < 0 ? Direction.West : currentDirection - 1;
else
currentDirection = (int)currentDirection + 1 > 3 ? Direction.North : currentDirection + 1;
switch(currentDirection)
{
case Direction.North:
currentY += instruction.StepCount;
break;
case Direction.East:
currentX += instruction.StepCount;
break;
case Direction.South:
currentY -= instruction.StepCount;
break;
case Direction.West:
currentX -= instruction.StepCount;
break;
}
}
return Math.Abs(currentX) + Math.Abs(currentY);
}
public int GetDistanceB()
{
int currentX = 0, currentY = 0;
Direction currentDirection = Direction.North;
List<Point> history = new List<Point>();
foreach (Instruction instruction in instructions)
{
if (instruction.Side == Side.Left)
currentDirection = (int)currentDirection - 1 < 0 ? Direction.West : currentDirection - 1;
else
currentDirection = (int)currentDirection + 1 > 3 ? Direction.North : currentDirection + 1;
for (int i = 0; i < instruction.StepCount; i++)
{
switch (currentDirection)
{
case Direction.North:
currentY += 1;
break;
case Direction.East:
currentX += 1;
break;
case Direction.South:
currentY -= 1;
break;
case Direction.West:
currentX -= 1;
break;
}
Point point = new Point(currentX, currentY);
if (history.Find(value => value.X == currentX && value.Y == currentY) != null)
return Math.Abs(currentX) + Math.Abs(currentY);
history.Add(point);
}
}
return 0;
}
}
class Program
{
static void Main(string[] args)
{
bscott01 test = new bscott01();
// PART 1
test.ClearInstructions();
test.LoadInstructions("R2, L3");
Console.WriteLine("Distance: {0}", test.GetDistanceA());
test.ClearInstructions();
test.LoadInstructions("R2, R2, R2");
Console.WriteLine("Distance: {0}", test.GetDistanceA());
test.ClearInstructions();
test.LoadInstructions("R5, L5, R5, R3");
Console.WriteLine("Distance: {0}", test.GetDistanceA());
test.ClearInstructions();
test.LoadInstructions("R3, L2, L2, R4, L1, R2, R3, R4, L2, R4, L2, L5, L1, R5, R2, R2, L1, R4, R1, L5, L3, R4, R3, R1, L1, L5, L4, L2, R5, L3, L4, R3, R1, L3, R1, L3, R3, L4, R2, R5, L190, R2, L3, R47, R4, L3, R78, L1, R3, R190, R4, L3, R4, R2, R5, R3, R4, R3, L1, L4, R3, L4, R1, L4, L5, R3, L3, L4, R1, R2, L4, L3, R3, R3, L2, L5, R1, L4, L1, R5, L5, R1, R5, L4, R2, L2, R1, L5, L4, R4, R4, R3, R2, R3, L1, R4, R5, L2, L5, L4, L1, R4, L4, R4, L4, R1, R5, L1, R1, L5, R5, R1, R1, L3, L1, R4, L1, L4, L4, L3, R1, R4, R1, R1, R2, L5, L2, R4, L1, R3, L5, L2, R5, L4, R5, L5, R3, R4, L3, L3, L2, R2, L5, L5, R3, R4, R3, R4, R3, R1");
Console.WriteLine("Distance: {0}", test.GetDistanceA());
// PART 2
test.ClearInstructions();
test.LoadInstructions("R8, R4, R4, R8");
Console.WriteLine("Distance: {0}", test.GetDistanceB());
test.ClearInstructions();
test.LoadInstructions("R3, L2, L2, R4, L1, R2, R3, R4, L2, R4, L2, L5, L1, R5, R2, R2, L1, R4, R1, L5, L3, R4, R3, R1, L1, L5, L4, L2, R5, L3, L4, R3, R1, L3, R1, L3, R3, L4, R2, R5, L190, R2, L3, R47, R4, L3, R78, L1, R3, R190, R4, L3, R4, R2, R5, R3, R4, R3, L1, L4, R3, L4, R1, L4, L5, R3, L3, L4, R1, R2, L4, L3, R3, R3, L2, L5, R1, L4, L1, R5, L5, R1, R5, L4, R2, L2, R1, L5, L4, R4, R4, R3, R2, R3, L1, R4, R5, L2, L5, L4, L1, R4, L4, R4, L4, R1, R5, L1, R1, L5, R5, R1, R1, L3, L1, R4, L1, L4, L4, L3, R1, R4, R1, R1, R2, L5, L2, R4, L1, R3, L5, L2, R5, L4, R5, L5, R3, R4, L3, L3, L2, R2, L5, L5, R3, R4, R3, R4, R3, R1");
Console.WriteLine("Distance: {0}", test.GetDistanceB());
Console.ReadLine();
}
}
}

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/*
* Advent of Code 2016
* Day 2 (part 1 and 2)
*/
using System;
using System.Text;
namespace adventofcode
{
enum KeypadType
{
Exercise01,
Exercise02
}
class bscott02
{
private int x = 1, y = 1;
protected void ResetA()
{
this.x = 1;
this.y = 1;
}
protected void ResetB()
{
this.x = 0;
this.y = 2;
}
public string GetCode(string[] input, KeypadType keypadType)
{
StringBuilder outputBuffer = new StringBuilder();
if (keypadType == KeypadType.Exercise01)
ResetA();
else
ResetB();
for (int i = 0; i < input.Length; i++)
{
if (keypadType == KeypadType.Exercise01)
outputBuffer.Append(GetDigitA(input[i]));
else
outputBuffer.Append(GetDigitB(input[i]));
}
return outputBuffer.ToString();
}
protected string GetDigitA(string input)
{
for (int i = 0; i < input.Length; i++)
{
switch(input[i])
{
case 'U':
if (y - 1 > -1) y--;
break;
case 'D':
if (y + 1 < 3) y++;
break;
case 'L':
if (x - 1 > -1) x--;
break;
case 'R':
if (x + 1 < 3) x++;
break;
}
}
return (((y * 3) + x) + 1).ToString();
}
protected string GetDigitB(string input)
{
int[][] map = new int[][]
{
new int[] { 0, 0, 1, 0, 0 },
new int[] { 0, 2, 3, 4, 0 },
new int[] { 5, 6, 7, 8, 9 },
new int[] { 0, 10, 11, 12, 0 },
new int[] { 0, 0, 13, 0, 0 }
};
for (int i = 0; i < input.Length; i++)
{
switch (input[i])
{
case 'U':
if (y - 1 > -1 && map[y - 1][x] != 0) y--;
break;
case 'D':
if (y + 1 < 5 && map[y + 1][x] != 0) y++;
break;
case 'L':
if (x - 1 > -1 && map[y][x - 1] != 0) x--;
break;
case 'R':
if (x + 1 < 5 && map[y][x + 1] != 0) x++;
break;
}
}
return String.Format("{0:X}", map[y][x]);
}
}
class Program
{
static void Main(string[] args)
{
bscott02 exercise2 = new bscott02();
string[] data = new string[]
{
"UUURRRRULRDLRDRRDURDDDLLDLLLULDUDDLDLULUURULRLDLRRLLLRRDRRLDDLLULUDUDDLRDRDUURDLURUURLRULLDDURULRRURDUURLULUUUURDDDDUUDLULRULLLRLLRRRURDLLRLLRRRUURULRDRUUDDDDDLLLRURRURRUURDUURDDRDLULRRLLLDRRRLURRLLURLDRRDDLDLRRLLRDRLLLLDLULDLRRDRRLDDURLULLUDLUDRRDRRLRLULURDRLRLUUUDLRLDLLLURDUDULULDDRUUURLLLDLLDDUDDRURURUDDLUULRDRRRRLDRDDURLUDURDULLDLUDLULDRLRLLRLLLLRURDURLLDRRDRLRUUUUULLLRUDURUDLLLUDLLLLRDLDRDUDRURLUDDUDDURLUUUUDDLLUDLULLLLLDUDLLRLRRDDDULULRLDRLLULDLUDLLURULRDDUURULRDLDLDLRL",
"URUUURDULUDLUUUUDDRRRDRRRLDUDLRDRRDRDDLRUULDLLDUDULLLRLDRDRRLDLDLUUDRUULDUDULDUDURURDDURULDLURULRLULDUDDUULDLLLDDURDDRDDURUULUUDRLDDULDRRRRDURRUDLLLURDDDLRULLRDDRDDDDLUUDRDUULRRRRURULDDDLDDRDRRUDRRURUDRDDLDRRRLLURURUULUUDRDULLDRLRDRRDDURDUDLDRLUDRURDURURULDUUURDUULRRRRRUDLLULDDDRLULDDULUDRRRDDRUDRRDLDLRUULLLLRRDRRLUDRUULRDUDRDRRRDDRLLRUUDRLLLUDUDLULUUDULDRRRRDDRURULDULLURDLLLDUUDLLUDRLDURRRLDDDURUDUDURRULDD",
"LRUDDULLLULRLUDUDUDRLLUUUULLUDLUUUUDULLUURDLLRDUDLRUDRUDDURURRURUDLLLRLDLUDRRRRRRDLUURLRDDDULRRUDRULRDRDDUULRDDLDULDRRRDDLURRURLLLRURDULLRUUUDDUDUURLRLDDUURLRDRRLURLDRLLUUURDRUUDUUUDRLURUUUDLDRRLRLLRRUURULLLRLLDLLLDULDDLDULDLDDRUDURDDURDUDURDLLLRRDDLULLLUDURLUDDLDLUUDRDRUDUUDLLDDLLLLDRDULRDLDULLRUDDUULDUDLDDDRUURLDRRLURRDDRUUDRUDLLDLULLULUDUDURDDRLRDLRLDRLDDRULLLRUDULDRLRLRULLRLLRRRLLRRRDDRULRUURRLLLRULDLUDRRDDLLLUDDUDDDLURLUDRDLURUUDLLDLULURRLLDURUDDDDRLULRDDLRLDDLRLLDDRRLRDUDUUULRRLRULUDURDUDRLRLRUDUDLLRRRRLRRUDUL",
"RULLLLUUUDLLDLLRULLRURRULDDRDLUULDRLLRUDLLRRLRDURLLDUUUUURUUURDLUURRLDDDLRRRRLRULDUDDLURDRRUUDLRRRDLDDUDUDDRUDURURLDULLDLULDLLUDLULRDRLLURRLLDURLDLRDLULUDDULDLDDDDDUURRDRURLDLDULLURDLLDDLLUDLDLDRLRLDLRDRLDLRRUUDRURLUUUDLURUULDUDRDULLDURUDLUUURRRLLDUDUDDUUULLLRUULDLURUDDRLUDRDDLDLLUDUDRRRDDUUULUULLLRLLUURDUUDRUUULULLDLDRUUDURLLUULRLDLUURLLUUDRURDDRLURULDUDUUDRRUUURDULRLDUUDDRURURDRRULDDDRLUDLLUUDURRRLDLRLRDRURLURLLLRLDDLRRLDLDDURDUUDRDRRLDRLULDRLURUUUDDRLLLDDLDURLLLLDRDLDRRUDULURRLULRDRLLUULLRLRDRLLULUURRUDRUDDDLLDURURLURRRDLLDRDLUDRULULULRLDLRRRUUDLULDURLRDRLULRUUURRDDLRUURUDRURUDURURDD",
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
};
Console.WriteLine("Exercise 02 - Part 1: {0}", exercise2.GetCode(data, KeypadType.Exercise01));
Console.WriteLine("Exercise 02 - Part 2: {0}", exercise2.GetCode(data, KeypadType.Exercise02));
Console.ReadLine();
}
}
}

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/*
* Advent of Code 2016
* Day 7 (Part 1 and 2)
*/
using System;
using System.Collections.Generic;
using System.IO;
namespace adventofcode
{
class bscott07
{
public static int GetTLSIPCount(string[] input)
{
int ipCount = 0;
for (int i = 0; i < input.Length; i++)
{
bool insideBracket = false;
bool hasMirrorSequence = false;
for (int j = 0; j < input[i].Length - 3; j++)
{
if (input[i][j] == '[')
{
insideBracket = true;
continue;
}
else if (input[i][j] == ']')
{
insideBracket = false;
continue;
}
if ((input[i][j] == input[i][j + 3] && input[i][j + 1] == input[i][j + 2])
&& (input[i][j] != input[i][j + 1] && input[i][j + 2] != input[i][j + 3]))
if (insideBracket)
break;
else
hasMirrorSequence = true;
}
if (!insideBracket && hasMirrorSequence)
ipCount++;
}
return ipCount;
}
public static int GetSSLIPCount(string[] input)
{
int ipCount = 0;
for (int i = 0; i < input.Length; i++)
{
bool insideBracket = false;
List<String> babSequences = new List<string>();
List<String> abaSequences = new List<string>();
for (int j = 0; j < input[i].Length - 2; j++)
{
if (input[i][j] == '[')
{
insideBracket = true;
continue;
}
else if (input[i][j] == ']')
{
insideBracket = false;
continue;
}
if (insideBracket)
{
if (input[i][j] == input[i][j + 2] && input[i][j] != input[i][j + 1])
babSequences.Add(input[i].Substring(j + 1, 1) + input[i].Substring(j, 1) + input[i].Substring(j + 1, 1)); // pre flip it
}
else
{
if (input[i][j] == input[i][j + 2] && input[i][j] != input[i][j + 1])
abaSequences.Add(input[i].Substring(j, 3));
}
}
if (babSequences.Count > 0 && abaSequences.Count > 0)
{
for (int j = 0; j < abaSequences.Count; j++)
{
if (babSequences.Contains(abaSequences[j]))
{
ipCount++;
break;
}
}
}
}
return ipCount;
}
}
class Program
{
static void Main(string[] args)
{
string[] input = File.ReadAllLines("input_day07.txt");
Console.WriteLine("Part 1 - TLS IP Count: {0}", bscott07.GetTLSIPCount(input));
Console.WriteLine("Part 2 - SSL IP Count: {0}", bscott07.GetSSLIPCount(input));
Console.ReadLine();
}
}
}

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/*
* Advent of Code 2016
* Day 8 (part 1 and 2)
*/
using System;
using System.IO;
namespace adventofcode
{
class bscott08
{
private int _width, _height;
private byte[] _screenData;
public bscott08(int width, int height)
{
_width = width;
_height = height;
_screenData = new byte[width * height];
Clear();
}
public void Clear()
{
// clear the screen
for (int i = 0; i < _screenData.Length; i++)
_screenData[i] = (byte)'.';
}
public void ProcessInstruction(string instruction)
{
string[] args = instruction.Split(new char[] { ' ' });
int width = 0, height = 0, x = 0, y = 0, count = 0;
switch (args[0])
{
case "rect":
string[] dimensions = args[1].Split(new char[] { 'x' });
int.TryParse(dimensions[0], out width);
int.TryParse(dimensions[1], out height);
Rect(width, height);
break;
case "rotate":
if (args[1] == "column")
{
int.TryParse(args[2].Substring(2), out x);
int.TryParse(args[4], out count);
RotateColumn(x, count);
}
else
{
int.TryParse(args[2].Substring(2), out y);
int.TryParse(args[4], out count);
RotateRow(y, count);
}
break;
}
}
private byte GetPixel(int y, int x)
{
return _screenData[(y * _width) + x];
}
private void SetPixel(int y, int x, byte value)
{
_screenData[(y * _width) + x] = value;
}
private void Rect(int width, int height)
{
for (int y = 0; y < height; y++)
for (int x = 0; x < width; x++)
SetPixel(y, x, (byte)'#');
}
private void RotateColumn(int x, int count)
{
byte[] tempColumn = new byte[_height];
// minipulate temp column
for (int y = 0; y < _height; y++)
tempColumn[(y + count) % _height] = GetPixel(y, x);
for (int y = 0; y < _height; y++)
SetPixel(y, x, tempColumn[y]);
}
private void RotateRow(int y, int count)
{
byte[] tempRow = new byte[_width];
// minipulate temp row
for (int x = 0; x < _width; x++)
tempRow[(x + count) % _width] = GetPixel(y, x);
for (int x = 0; x < _width; x++)
SetPixel(y, x, tempRow[x]);
}
public int GetLitPixels()
{
int result = 0;
for (int i = 0; i < _screenData.Length; i++)
if (_screenData[i] != (byte)'.')
result++;
return result;
}
public void DumpScreen()
{
for (int y = 0; y < _height; y++)
{
for (int x = 0; x < _width; x++)
{
Console.Write((char)GetPixel(y, x));
}
Console.Write("\n");
}
Console.Write("\n");
}
}
class Program
{
static void Main(string[] args)
{
bscott08 day08 = new bscott08(50, 6);
string[] input = File.ReadAllLines("input_day08.txt");
for (int i = 0; i < input.Length; i++)
day08.ProcessInstruction(input[i]);
// Part 1 ( don't skim over the instructions >_< )
Console.WriteLine("Pixels Lit: {0}\n", day08.GetLitPixels());
// Part 2
Console.WriteLine("Screen Dump: ");
day08.DumpScreen();
Console.ReadLine();
}
}
}

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/*
* Advent of Code 2016
* Day 9 (part 1 and 2)
*/
using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
namespace adventofcode
{
class bscott09
{
public static long CalcDecompressedLength(string input, bool recursive = false, int level = 0)
{
long decompressedLength = 0;
MatchCollection matchCollection = Regex.Matches(input, @"\((\d+)x(\d+)\)");
int lastMatchIndex = 0, nextCmdPosition = 0;
int length = 0, repeatCount = 0;
// nothing to process
if (matchCollection.Count == 0 || level > 25)
return input.Length;
// pre-inline data
if (matchCollection[0].Index > 0)
{
nextCmdPosition = matchCollection[0].Index;
decompressedLength += matchCollection[0].Index;
}
// cycle through detected commands, ignore non-commands, include inline data
foreach (Match m in matchCollection)
{
int.TryParse(m.Groups[1].Value, out length);
int.TryParse(m.Groups[2].Value, out repeatCount);
if (m.Index >= nextCmdPosition)
{
// inline data
if (m.Index > nextCmdPosition)
decompressedLength += (m.Index - nextCmdPosition);
string payload = input.Substring(m.Index + m.Length, length);
long payloadLength = recursive ? CalcDecompressedLength(payload, true, level++) : payload.Length;
decompressedLength += (payloadLength * repeatCount);
lastMatchIndex = m.Index;
nextCmdPosition = (m.Index + m.Length) + length;
}
}
// trailing inline data
if (lastMatchIndex != nextCmdPosition)
decompressedLength += (input.Length - nextCmdPosition);
return decompressedLength;
}
public static string Decompress(string input, bool recursiveDecompress = false, int level = 0, int maxLevel = 25)
{
StringBuilder output = new StringBuilder();
MatchCollection matchCollection = Regex.Matches(input, @"\((\d+)x(\d+)\)");
int lastMatchIndex = 0, nextCmdPosition = 0;
int length = 0, repeatCount = 0;
// nothing to process or the recursion level is too high
if (matchCollection.Count == 0 || level > maxLevel)
return input;
// pre-inline data
if (matchCollection[0].Index > 0)
{
nextCmdPosition = matchCollection[0].Index;
output.Append(input.Substring(0, matchCollection[0].Index));
}
// cycle through detected commands, ignore non-commands, include inline data
foreach (Match m in matchCollection)
{
int.TryParse(m.Groups[1].Value, out length);
int.TryParse(m.Groups[2].Value, out repeatCount);
if (m.Index >= nextCmdPosition)
{
// inline data
if (m.Index > nextCmdPosition)
output.Append(input.Substring(nextCmdPosition, m.Index - nextCmdPosition));
string payload = input.Substring(m.Index + m.Length, length);
if (recursiveDecompress)
payload = Decompress(payload, true, level++);
for (int i = 0; i < repeatCount; i++)
output.Append(payload);
lastMatchIndex = m.Index;
nextCmdPosition = (m.Index + m.Length) + length;
}
}
// trailing inline data
if (lastMatchIndex != nextCmdPosition)
{
output.Append(input.Substring(nextCmdPosition, input.Length - nextCmdPosition));
}
return output.ToString();
}
}
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Part 1 Example Length: {0}", bscott09.CalcDecompressedLength("ADVENT"));
Console.WriteLine("Part 1 Example Length: {0}", bscott09.CalcDecompressedLength("A(1x5)BC"));
Console.WriteLine("Part 1 Example Length: {0}", bscott09.CalcDecompressedLength("(3x3)XYZ"));
Console.WriteLine("Part 1 Example Length: {0}", bscott09.CalcDecompressedLength("A(2x2)BCD(2x2)EFG"));
Console.WriteLine("Part 1 Example Length: {0}", bscott09.CalcDecompressedLength("(6x1)(1x3)A"));
Console.WriteLine("Part 1 Example Length: {0}", bscott09.CalcDecompressedLength("X(8x2)(3x3)ABCY"));
Console.WriteLine("Part 1 Example: {0}", bscott09.Decompress("ADVENT"));
Console.WriteLine("Part 1 Example: {0}", bscott09.Decompress("A(1x5)BC"));
Console.WriteLine("Part 1 Example: {0}", bscott09.Decompress("(3x3)XYZ"));
Console.WriteLine("Part 1 Example: {0}", bscott09.Decompress("A(2x2)BCD(2x2)EFG"));
Console.WriteLine("Part 1 Example: {0}", bscott09.Decompress("(6x1)(1x3)A"));
Console.WriteLine("Part 1 Example: {0}", bscott09.Decompress("X(8x2)(3x3)ABCY"));
// Part 2
string input = File.ReadAllText("input_day09.txt").Trim();
Console.WriteLine("Part 1 Length: {0}\n", bscott09.CalcDecompressedLength(input));
Console.WriteLine("Part 2 Example Length: {0}", bscott09.CalcDecompressedLength("(25x3)(3x3)ABC(2x3)XY(5x2)PQRSTX(18x9)(3x2)TWO(5x7)SEVEN", true));
Console.WriteLine("Part 2 Length: {0}\n", bscott09.CalcDecompressedLength(input, true));
Console.ReadLine();
}
}
}

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/*
* Advent of Code 2016
* Day 10 (part 1 and 2)
*/
using System;
using System.Collections.Generic;
using System.IO;
namespace adventofcode
{
class Bot
{
public int Index { get; }
public int[] Values { get; set; }
public string LowDestination { get; set; }
public int LowDestinationId { get; set; }
public string HighDestination { get; set; }
public int HighDestinationId { get; set; }
public Bot(int index)
{
Index = index;
Values = new int[2] { -1, -1 };
LowDestination = "";
LowDestinationId = -1;
HighDestination = "";
HighDestinationId = -1;
}
public bool SetValue(int value)
{
if (this.Values[0] == -1)
this.Values[0] = value;
else if (this.Values[1] == -1)
this.Values[1] = value;
else
return false; // both values already set?
return true;
}
public bool HasBothValues()
{
return this.Values[0] > -1 && this.Values[1] > -1;
}
public int GetAndClearLowValue()
{
int lowValueIndex = this.Values[0] > this.Values[1] ? 1 : 0;
int lowValue = this.Values[lowValueIndex];
this.Values[lowValueIndex] = -1;
return lowValue;
}
public int GetAndClearHighValue()
{
int highValueIndex = this.Values[0] < this.Values[1] ? 1 : 0;
int highValue = this.Values[highValueIndex];
this.Values[highValueIndex] = -1;
return highValue;
}
public override string ToString()
{
return String.Format("Bot HasBothValues={0}, LowDestination={1}, LowDestinationId={2}, HighDestination={3}, HighDestinationId={4}",
this.HasBothValues(), this.LowDestination, this.LowDestinationId, this.HighDestination, this.HighDestinationId);
}
}
class ComparisonLogEntry
{
public int Index { get; set; }
public int ValueA { get; set; }
public int ValueB { get; set; }
public ComparisonLogEntry(int index, int valueA, int valueB)
{
this.Index = index;
this.ValueA = valueA;
this.ValueB = valueB;
}
}
class bscott10
{
private Dictionary<int, Bot> bots = new Dictionary<int, Bot>();
private Dictionary<int, int> outputs = new Dictionary<int, int>();
private List<ComparisonLogEntry> comparisonLog = new List<ComparisonLogEntry>();
public bscott10()
{
// precreate all the bots and outputs (pointless robots and outputs shouldn't hurt anything right?)
for (int i = 0; i < 1000; i++)
{
bots.Add(i, new Bot(i));
outputs.Add(i, -1);
}
}
public Dictionary<int, int> Outputs
{
get { return outputs; }
}
public List<ComparisonLogEntry> ComparisonLog
{
get { return comparisonLog; }
}
public void DumpOutputs()
{
for (int i = 0; i < 1000; i++)
if (outputs[i] != -1)
Console.WriteLine($"Output {i} = {outputs[i]}");
}
public int PerformActions()
{
int actionsPerformed = 0;
foreach (KeyValuePair<int, Bot> bot in bots)
{
Bot pBot = bot.Value;
// we can do something I think....
if (pBot.HasBothValues())
{
// this is overkill, but i can't think of a better way to have a public interface to fetch a specific bot by
// what comparisons it did.
comparisonLog.Add(new ComparisonLogEntry(bot.Key, pBot.Values[0], pBot.Values[1]));
// perform low action
if (pBot.LowDestination == "output")
outputs[pBot.LowDestinationId] = pBot.GetAndClearLowValue();
else if (pBot.LowDestination == "bot")
bots[pBot.LowDestinationId].SetValue(pBot.GetAndClearLowValue());
// perform high action
if (pBot.HighDestination == "output")
outputs[pBot.HighDestinationId] = pBot.GetAndClearHighValue();
else if (pBot.HighDestination == "bot")
bots[pBot.HighDestinationId].SetValue(pBot.GetAndClearHighValue());
actionsPerformed++;
}
}
return actionsPerformed;
}
public void ProcessInstruction(string instruction)
{
string[] args = instruction.Split(new char[] { ' ' });
int botId = -1;
int value = -1;
string lowDest = "";
int lowDestId = -1;
string highDest = "";
int highDestId = -1;
if (args[0] == "value")
{
int.TryParse(args[1], out value);
int.TryParse(args[5], out botId);
// set a value.
bots[botId].SetValue(value);
}
else if (args[0] == "bot")
{
int.TryParse(args[1], out botId);
lowDest = args[5];
int.TryParse(args[6], out lowDestId);
highDest = args[10];
int.TryParse(args[11], out highDestId);
bots[botId].LowDestination = lowDest;
bots[botId].LowDestinationId = lowDestId;
bots[botId].HighDestination = highDest;
bots[botId].HighDestinationId = highDestId;
}
}
}
class Program
{
static void Main(string[] args)
{
bscott10 day10 = new bscott10();
string[] input = File.ReadAllLines("input_day10.txt");
// first you process everything
for (int i = 0; i < input.Length; i++)
day10.ProcessInstruction(input[i]);
// then set everything in motion
int actions = day10.PerformActions();
while (actions > 0)
{
Console.WriteLine($"Performed {actions} actions.");
actions = day10.PerformActions();
}
// Part 1
foreach (ComparisonLogEntry cle in day10.ComparisonLog)
{
if ((cle.ValueA == 61 && cle.ValueB == 17) ||
(cle.ValueA == 17 && cle.ValueB == 61))
{
Console.WriteLine($"Part 1 Answer: Bot {cle.Index}");
}
}
// Part 2
int value = day10.Outputs[0] * day10.Outputs[1] * day10.Outputs[2];
Console.WriteLine($"Part 2 Answer: {value}");
Console.ReadLine();
}
}
}

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/*
* Advent of Code 2016
* Day 12 (part 1 and 2)
*/
using System;
using System.Collections.Generic;
using System.IO;
namespace adventofcode
{
class bscott12
{
private Dictionary<string, int> registers = new Dictionary<string, int>();
private int pc = 0;
public Dictionary<string, int> Registers
{
get { return registers; }
}
public bscott12()
{
for (char i = 'a'; i <= 'd'; i++)
registers.Add(i.ToString(), 0);
}
public void Reset()
{
for (char i = 'a'; i <= 'd'; i++)
registers[i.ToString()] = 0;
pc = 0;
}
public void Process(string[] instructions)
{
while(pc < instructions.Length)
ProcessInstruction(instructions[pc]);
}
public void ProcessInstruction(string instruction)
{
string[] arguments = instruction.Split(new char[] { ' ' });
int value = 0;
bool branch = false;
switch (arguments[0])
{
case "cpy":
if (arguments[1][0] >= '0' && arguments[1][0] <= '9')
int.TryParse(arguments[1], out value);
else
value = registers[arguments[1]];
registers[arguments[2]] = value;
break;
case "inc":
registers[arguments[1]]++;
break;
case "dec":
registers[arguments[1]]--;
break;
case "jnz":
if (arguments[1][0] >= '0' && arguments[1][0] <= '9')
int.TryParse(arguments[1], out value);
else
value = registers[arguments[1]];
int jumpOffset = int.Parse(arguments[2]);
if (value != 0)
{
pc = pc + jumpOffset;
branch = true;
}
break;
}
if(!branch) pc++;
}
}
class Program
{
static void Main(string[] args)
{
bscott12 day12 = new bscott12();
string[] input = File.ReadAllLines("input_day12.txt");
// part 1
day12.Process(input);
Console.Write("Part 1: ");
for (char i = 'a'; i <= 'd'; i++)
Console.Write(i.ToString() + " = " + day12.Registers[i.ToString()] + ", ");
Console.Write("\n");
// part 2
day12.Reset();
day12.Registers["c"] = 1;
day12.Process(input);
Console.Write("Part 2: ");
for (char i = 'a'; i <= 'd'; i++)
Console.Write(i.ToString() + " = " + day12.Registers[i.ToString()] + ", ");
Console.Write("\n");
Console.ReadLine();
}
}
}

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{****************************************************************************
Advent of Code 2016
Day 6 (part 1 and 2)
****************************************************************************}
program bscott06;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Classes, SysUtils, CustApp
{ you can add units after this };
type
{ TAdventOfCodeDay06 }
TAdventOfCodeDay06 = class(TCustomApplication)
protected
procedure DoRun; override;
public
constructor Create(TheOwner: TComponent); override;
destructor Destroy; override;
end;
{ TAdventOfCodeDay06 }
procedure TAdventOfCodeDay06.DoRun;
var
CharCountArrArray: array [0..7, 'a'..'z'] of Integer;
Password: array [0..7] of Char;
CharCount, I : Integer;
J: Char;
CurrentLine: String;
InputDataFile: text;
begin
FillChar (CharCountArrArray,SizeOf(CharCountArrArray),0);
FillChar (Password,SizeOf(Password),0);
AssignFile(InputDataFile, 'day6_input.txt');
Reset(InputDataFile);
while not eof(InputDataFile) do
begin
readln(InputDataFile, CurrentLine);
Inc(CharCountArrArray[0, CurrentLine[1]],1);
Inc(CharCountArrArray[1, CurrentLine[2]],1);
Inc(CharCountArrArray[2, CurrentLine[3]],1);
Inc(CharCountArrArray[3, CurrentLine[4]],1);
Inc(CharCountArrArray[4, CurrentLine[5]],1);
Inc(CharCountArrArray[5, CurrentLine[6]],1);
Inc(CharCountArrArray[6, CurrentLine[7]],1);
Inc(CharCountArrArray[7, CurrentLine[8]],1);
end;
CloseFile(InputDataFile);
for I := 0 to 7 do
begin
CharCount := 0;
for J := 'a' to 'z' do
begin
if CharCount < CharCountArrArray[I, J] then
begin
Password[I] := J;
CharCount := CharCountArrArray[I, J];
end;
end;
end;
writeln('Part A Password: ' + Password);
FillChar (Password,SizeOf(Password),0) ;
for I := 0 to 7 do
begin
CharCount := 0;
for J := 'a' to 'z' do
begin
if (CharCountArrArray[I, J] > 0) and ((CharCount > CharCountArrArray[I, J]) or (CharCount = 0)) then
begin
Password[I] := J;
CharCount := CharCountArrArray[I, J];
end;
end;
end;
writeln('Part B Password: ' + Password);
{ add your program here }
ReadLn;
// stop program loop
Terminate;
end;
constructor TAdventOfCodeDay06.Create(TheOwner: TComponent);
begin
inherited Create(TheOwner);
StopOnException:=True;
end;
destructor TAdventOfCodeDay06.Destroy;
begin
inherited Destroy;
end;
var
Application: TAdventOfCodeDay06;
begin
Application:=TAdventOfCodeDay06.Create(nil);
Application.Title:='Advent of Code - Day 6';
Application.Run;
Application.Free;
end.

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<?php
/*
* Advent of Code 2016
* Day 3 (part 1 and 2)
*/
function isValidTriangle($a, $b, $c) {
return ($a + $b > $c && $a + $c > $b && $b + $c > $a);
}
$input = file('day3_input.txt');
$valid_triangle_count = 0;
foreach($input as $line) {
$args = array_values(array_filter(explode(' ', $line)));
if(isValidTriangle((int)$args[0], (int)$args[1], (int)$args[2]))
$valid_triangle_count++;
}
echo "Part 1 Count: $valid_triangle_count\n";
$valid_triangle_count = 0;
for($i = 0; $i < count($input); $i += 3) {
$args1 = array_values(array_filter(explode(' ', $input[$i+0])));
$args2 = array_values(array_filter(explode(' ', $input[$i+1])));
$args3 = array_values(array_filter(explode(' ', $input[$i+2])));
if(isValidTriangle((int)$args1[0], (int)$args2[0], (int)$args3[0]))
$valid_triangle_count++;
if(isValidTriangle((int)$args1[1], (int)$args2[1], (int)$args3[1]))
$valid_triangle_count++;
if(isValidTriangle((int)$args1[2], (int)$args2[2], (int)$args3[2]))
$valid_triangle_count++;
}
echo "Part 2 Count: $valid_triangle_count\n";

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<?php
/*
* Advent of Code 2016
* Day 4 (part 1 and 2)
*/
function extractRoomInfo($input_line) {
if(preg_match("/(\S+)-(\d+)\[([^\]]*)\]/", $input_line, $output_array)) {
return array(
'room_name' => $output_array[1],
'sector_id' => $output_array[2],
'checksum' => $output_array[3]
);
}
return false;
}
function generateChecksum($room_name) {
// calculate char occurrences
$char_count_array = count_chars(str_replace('-', '', $room_name), 1);
// sort by occurrence count
arsort($char_count_array);
// group chars into occurrence count
$dedupe = array();
foreach($char_count_array as $char => $occurrence) {
$dedupe[$occurrence][] = $char;
}
// cross my fingers and hope this actually works
$checksum = '';
foreach($dedupe as $occurrence => $chars) {
sort($chars);
for($i = 0; $i < count($chars); $i++) {
$checksum .= chr($chars[$i]);
}
}
// cut off the excess and return
return substr($checksum, 0, 5);
}
function decryptRoomName($name, $sector_id) {
$key = $sector_id % 26; // this should work right?
$a_start = ord('a');
$output = '';
for($i = 0; $i < strlen($name); $i++) {
$a = ord(substr($name, $i, 1));
if($a == ord('-'))
$output .= ' ';
else
$output .= chr($a_start + ((($a - $a_start) + $key) % 26));
}
return $output;
}
$input = file('day4_input.txt');
//$input = array("aaaaa-bbb-z-y-x-123[abxyz]", "a-b-c-d-e-f-g-h-987[abcde]", "not-a-real-room-404[oarel]");
// Part 1
$valid_room_sum = 0;
$valid_rooms = array();
foreach($input as $line) {
$room_info = extractRoomInfo($line);
$generated_checksum = generateChecksum($room_info['room_name']);
if($generated_checksum == $room_info['checksum']) {
$valid_rooms[] = $room_info;
$valid_room_sum += (int)$room_info['sector_id'];
}
}
echo "valid room sum: $valid_room_sum<br />\n";
// Part 2
foreach($valid_rooms as $room) {
$decrypted_name = decryptRoomName($room['room_name'], (int)$room['sector_id']);
echo "room name: $decrypted_name, sector: {$room['sector_id']}<br />\n";
}

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<?php
set_time_limit(0);
/*
* Advent of Code 2016
* Day 5 (part 1 and 2)
*/
function calculateHashes($salt, $max = 8) {
$result = array();
$count = 0;
$start = 0;
$cache_file = md5($salt).".cache";
if(file_exists($cache_file)) {
$result = file($cache_file);
if(count($result) >= $max)
return $result;
}
for($i = 0; $i < 1000000000; $i++) {
$hash = md5($salt.$i);
if(substr($hash, 0, 5) === '00000') {
$result[$count++] = $hash;
if($count >= $max)
break;
}
}
file_put_contents($cache_file, implode("\n", $result));
return $result;
}
$puzzle_input = 'reyedfim';
$hashes = calculateHashes($puzzle_input, 30);
// Part 1
$password = '';
for($i = 0; $i < 8; $i++) {
$password .= substr($hashes[$i], 5, 1);
}
echo "Step 1 Password: $password\n";
// Part 2
$password = array_fill(0, 8, '_');
for($i = 0; $i < count($hashes); $i++) {
$pos = substr($hashes[$i], 5, 1);
$char = substr($hashes[$i], 6, 1);
if (is_numeric($pos) && (int)$pos < 8 && $password[(int)$pos] === '_')
$password[(int)$pos] = $char;
}
echo "Step 2 Password: ".implode($password);