Advent of Code – Day 3

http://adventofcode.com/day/3

Advent of Code is a series of small programming puzzles for a variety of skill levels. They are self-contained and are just as appropriate for an expert who wants to stay sharp as they are for a beginner who is just learning to code. Each puzzle calls upon different skills and has two parts that build on a theme.

	// part 1
	var input = "<input here>";
	var visited = new List<Point> { new Point(0, 0) };
	var x = 0;
	var y = 0;
	foreach (var d in input)
	{
	if (d == 'v') y--;
	if (d == '>') x++;
	if (d == '^') y++;
	if (d == '<') x--;
	if (!visited.Any(a => a.X == x && a.Y == y))
	{
	visited.Add(new Point(x, y));
	}
	}
	// part 2
	var input = "<input here>";
	var visited = new List<Point> { new Point(0, 0) };
	var x1 = 0;
	var y1 = 0;
	var x2 = 0;
	var y2 = 0;
	var i = 0;
	foreach (var d in input)
	{
	var x = 0;
	var y = 0;
	if (i % 2 == 0)
	{
	if (d == 'v') y1--;
	if (d == '>') x1++;
	if (d == '^') y1++;
	if (d == '<') x1--;
	x = x1;
	y = y1;
	}
	else
	{
	if (d == 'v') y2--;
	if (d == '>') x2++;
	if (d == '^') y2++;
	if (d == '<') x2--;
	x = x2;
	y = y2;
	}
	if (!visited.Any(a => a.X == x && a.Y == y))
	{
	visited.Add(new Point(x, y));
	}
	i++;
	}

view raw AdventOfCodeDay3.cs hosted with by GitHub