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