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+using Accord.Video.FFMPEG;
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+using System;
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+using System.Collections.Generic;
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+using System.Drawing;
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+using System.IO;
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+using System.Linq;
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+
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+namespace D13._3
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+{
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+ class Track : Dictionary<(int x, int y), char> { };
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+ class Carts : List<(int x, int y, int vx, int vy, int t, Color c)> { };
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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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+ if (args.Length < 1) return;
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+ if (File.Exists(args[0]) == false) return;
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+ var file = File.OpenText(args[0]);
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+
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+ var track = new Track();
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+ var carts = new Carts();
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+
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+ FillTrack(file, track, carts);
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+
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+ int width = track.Max(c => c.Key.x) + 1;
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+ int height = track.Max(c => c.Key.y) + 1;
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+ VideoFileWriter writer = new VideoFileWriter();
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+ writer.Open("out.avi", width, height);
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+
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+ int? last = null;
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+ do
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+ {
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+ last = lastCart(carts);
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+
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+ Bitmap image = new Bitmap(width, height);
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+ foreach (var t in track) image.SetPixel(t.Key.x, t.Key.y, Color.White);
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+ foreach (var t in carts) image.SetPixel(t.x, t.y, t.c);
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+
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+ writer.WriteVideoFrame(image);
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+
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+ carts.Sort((a, b) => a.x.CompareTo(b.x));
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+ carts.Sort((a, b) => a.y.CompareTo(b.y));
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+
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+ tick(track, carts);
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+
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+ } while (last == null) ;
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+
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+ writer.Close();
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+ }
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+
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+ private static void FillTrack(StreamReader file, Track track, Carts carts)
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+ {
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+ int y = 0;
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+ do
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+ {
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+ var line = file.ReadLine();
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+ if (line == null) break;
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+
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+ for (int x = 0; x < line.Length; ++x)
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+ {
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+ char c = line[x];
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+ if (c == ' ') continue;
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+
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+ if (isCart(c))
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+ {
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+ carts.Add(getCart(c, x, y));
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+ c = c == '>' || c == '<' ? '-' : '|';
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+ }
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+
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+ track[(x, y)] = c;
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+ }
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+
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+ y++;
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+
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+ } while (true);
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+ }
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+
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+ private static void tick(Track track, Carts carts)
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+ {
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+ for (var i = 0; i < carts.Count; ++i)
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+ {
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+ var cart = carts[i];
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+ if (cart == default) continue;
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+
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+ cart.x += cart.vx;
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+ cart.y += cart.vy;
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+
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+ if (inter(carts, cart, i)) continue;
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+
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+ var c = track[(cart.x, cart.y)];
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+
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+ var ncart = getCart(c, cart);
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+ carts[i] = ncart;
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+ }
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+ }
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+
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+ static int? lastCart(Carts carts)
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+ {
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+ int count = 0;
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+ int? cart = null;
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+
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+ for (var i = 0; i < carts.Count; ++i)
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+ {
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+ if (carts[i] == default) continue;
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+
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+ cart = i;
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+ count++;
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+ }
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+ return count == 1 ? cart : null;
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+ }
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+
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+ static bool inter(Carts carts, (int x, int y, int vx, int vy, int t, Color c) cj, int skip)
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+ {
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+ for (var i = 0; i < carts.Count; ++i)
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+ {
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+ if (i == skip) continue;
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+
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+ var ci = carts[i];
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+ if (ci == default) continue;
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+
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+ if (ci.x == cj.x && ci.y == cj.y)
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+ {
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+ carts[i] = default;
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+ carts[skip] = default;
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+ return true;
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+ }
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+ }
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+
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+ return false;
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+ }
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+
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+ static bool isCart(char c)
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+ {
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+ return c == '>' || c == '<' || c == '^' || c == 'v';
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+ }
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+
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+ static (int x, int y, int vx, int vy, int t, Color c) getCart(char c, int x, int y)
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+ {
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+ var r = new Random();
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+ switch (c)
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+ {
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+ case '>': return (x, y, +1, +0, 0, Color.FromArgb(r.Next(0, 255), r.Next(0, 255), r.Next(0, 255)));
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+ case '<': return (x, y, -1, +0, 0, Color.FromArgb(r.Next(0, 255), r.Next(0, 255), r.Next(0, 255)));
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+ case '^': return (x, y, +0, -1, 0, Color.FromArgb(r.Next(0, 255), r.Next(0, 255), r.Next(0, 255)));
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+ case 'v': return (x, y, +0, +1, 0, Color.FromArgb(r.Next(0, 255), r.Next(0, 255), r.Next(0, 255)));
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+ }
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+ return default;
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+ }
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+
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+ static (int x, int y, int vx, int vy, int t, Color c) getCart(char c, (int x, int y, int vx, int vy, int t, Color c) cart)
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+ {
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+ if (c == '|' || c == '-') return cart;
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+ if (c == '+' && cart.t == 1)
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+ {
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+ cart.t++;
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+ return cart;
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+ }
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+
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+ switch (cart)
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+ {
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+ case var t when t.vx == 1 && t.vy == 0:
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+
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+ if (c == '/') return (cart.x, cart.y, +0, -1, cart.t, cart.c);
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+ if (c == '\\') return (cart.x, cart.y, +0, +1, cart.t, cart.c);
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+ if (c == '+' && cart.t == 0) return (cart.x, cart.y, +0, -1, 1, cart.c);
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+ if (c == '+' && cart.t == 2) return (cart.x, cart.y, +0, +1, 0, cart.c);
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+ return default;
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+
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+ case var t when t.vx == -1 && t.vy == 0:
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+
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+ if (c == '/') return (cart.x, cart.y, +0, +1, cart.t, cart.c);
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+ if (c == '\\') return (cart.x, cart.y, +0, -1, cart.t, cart.c);
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+ if (c == '+' && cart.t == 0) return (cart.x, cart.y, +0, +1, 1, cart.c);
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+ if (c == '+' && cart.t == 2) return (cart.x, cart.y, +0, -1, 0, cart.c);
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+ return default;
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+
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+ case var t when t.vx == 0 && t.vy == 1:
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+
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+ if (c == '/') return (cart.x, cart.y, -1, +0, cart.t, cart.c);
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+ if (c == '\\') return (cart.x, cart.y, +1, +0, cart.t, cart.c);
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+ if (c == '+' && cart.t == 0) return (cart.x, cart.y, +1, +0, 1, cart.c);
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+ if (c == '+' && cart.t == 2) return (cart.x, cart.y, -1, +0, 0, cart.c);
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+ return default;
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+
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+ case var t when t.vx == 0 && t.vy == -1:
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+
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+ if (c == '/') return (cart.x, cart.y, +1, +0, cart.t, cart.c);
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+ if (c == '\\') return (cart.x, cart.y, -1, +0, cart.t, cart.c);
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+ if (c == '+' && cart.t == 0) return (cart.x, cart.y, -1, +0, 1, cart.c);
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+ if (c == '+' && cart.t == 2) return (cart.x, cart.y, +1, +0, 0, cart.c);
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+ return default;
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+ }
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+ return default;
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+ }
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+ }
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+}
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bastien.monsarrat