Code Golf: Connecting the dots

Answer 1

C#, 638 chars

using System;
using System.Linq;
using System.Text.RegularExpressions;

class C
{
    static void Main()
    {
        int i=0,j;
        var p = Console.In.ReadToEnd()
            .Split('\n')
            .SelectMany(
                r =>
                {
                    i++; j =0;
                    return Regex.Matches(r, "\\s+(\\d+)").Cast()
                    .Select(m => { j += m.Length; return new { X = j, Y = i-1, N = int.Parse(m.Groups[1].Value) }; });
                }
        ).OrderBy(a=>a.N).ToList();

        var W = p.Max(a => a.X)+1;
        var k = new char[W*i+W];
        i = 0;
        while (i < p.Count)
        {
            var b = p[i > 0 ? i - 1 : 0]; var a = p[i];
            int h = a.Y - b.Y, w = a.X - b.X;
            var s = "|-/\\"[h == 0 ? 1 : w == 0 ? 0 : h / w > 0 ? 3 : 2];
            while ((h | w) != 0) { k[b.X + w + W * (b.Y + h)] = s; h -= h.CompareTo(0); w -= w.CompareTo(0); }
            k[a.X + a.Y * W] = '+';
            k[W * ++i] = '\n';
        }

        Console.Write(k);
    }
}