Language agnostic 高尔夫代码：激光 挑战
按字符计数输入电路板二维表示的最短代码，并根据输入输出“真”或“假” 该板由4种类型的瓷砖制成：Language agnostic 高尔夫代码：激光 挑战,language-agnostic,code-golf,rosetta-stone,Language Agnostic,Code Golf,Rosetta Stone,按字符计数输入电路板二维表示的最短代码，并根据输入输出“真”或“假” 该板由4种类型的瓷砖制成： # - A solid wall x - The target the laser has to hit / or \ - Mirrors pointing to a direction (depends on laser direction) v, ^, > or < - The laser pointing to a direction (down, up, right an
# - A solid wall
x - The target the laser has to hit
/ or \ - Mirrors pointing to a direction (depends on laser direction)
v, ^, > or < - The laser pointing to a direction (down, up, right and left respectively)
#-坚固的墙
x-激光必须击中的目标
/or \-指向某个方向的反射镜（取决于激光方向）
v、 ^、>或<-指向某个方向的激光（分别为向下、向上、向右和向左）
^v>F#），36行，非常可读
好的，只是想得到一个答案：
let ReadInput() =
let mutable line = System.Console.ReadLine()
let X = line.Length
let mutable lines = []
while line <> null do
lines <- Seq.to_list line :: lines
line <- System.Console.ReadLine()
lines <- List.rev lines
X, lines.Length, lines
let X,Y,a = ReadInput()
let mutable p = 0,0,'v'
for y in 0..Y-1 do
for x in 0..X-1 do
printf "%c" a.[y].[x]
match a.[y].[x] with
|'v'|'^'|'<'|'>' -> p <- x,y,a.[y].[x]
|_ -> ()
printfn ""
let NEXT = dict [ '>', (1,0,'^','v')
'v', (0,1,'<','>')
'<', (-1,0,'v','^')
'^', (0,-1,'>','<') ]
let next(x,y,d) =
let dx, dy, s, b = NEXT.[d]
x+dx,y+dy,(match a.[y+dy].[x+dx] with
| '/' -> s
| '\\'-> b
| '#'|'v'|'^'|'>'|'<' -> printfn "false"; exit 0
| 'x' -> printfn "true"; exit 0
| ' ' -> d)
while true do
p <- next p
C89（209个字符）
这个小宏检查当前字符（*p
）是否等于字符形式的a
（*#a
）。如果它们相等，则将移动向量设置为b
（m=b
），将此字符标记为墙（*p=1
），并将起点设置为当前位置（q=p
）。此宏包括“else”部分
声明一些变量。
*q
是灯光的当前位置。
*G
将游戏板作为1D阵列。
*p
是填充G
时的当前读取位置。
*w
是电路板的宽度
main(m){
显然main
m
是一个存储运动矢量的变量。（作为优化，它是main
的一个参数。）
循环遍历所有字符，使用p
填充G
。跳过G[0]
作为优化（无需在的第三部分中再次浪费字符写入p
）
如果当前字符是行尾标记（ASCII 10），如果尚未设置宽度，请设置宽度。跳过的G[0]
允许我们写入w=p-G
，而不是w=p-G+1
。此外，这将结束M
的？：
链
for(;
q+=m,
通过移动向量移动灯光
m=
*q&4
?(*q&1?-1:1)*(
m/w?m/w:m*w
)
:*q&9
?!puts(*q&1?"false":"true")
:m
;
反映运动矢量
m=
*q&4
?(*q&1?-1:1)*(
m/w?m/w:m*w
)
:*q&9
?!puts(*q&1?"false":"true")
:m
;
如果这是墙或x
，请使用相应的消息退出（m=0
终止循环）。否则，什么也不做（noop；m=m
）
c（K&R）339个必要字符，在strager提出更多建议之后。
我体内的物理学家注意到，传播和反射操作是时间反转不变性的，所以这个版本，从目标发射光线，并检查光线是否到达激光发射器
其余的实现都是非常直接的，或多或少都是从我之前的努力中获得的
压缩：
#define R return
#define C case
#define Z x,y
int c,i,j,m[99][99],Z;s(d,e,Z){for(;;)switch(m[x+=d][y+=e]){C'^':R 1==e;
C'>':R-1==d;C'v':R-1==e;C'<':R 1==d;C'#':C'x':R 0;C 92:e=-e;d=-d;C'/':c=d;
d=-e;e=-c;}}main(){while((c=getchar())>0)c==10?i=0,j++:(c==120?x=i,y=j:
i,m[i++][j]=c);puts(s(1,0,Z)|s(0,1,Z)|s(-1,0,Z)|s(0,-1,Z)?"true":"false");}
#定义R返回
#定义C案例
#定义Z x，y
intc，i，j，m[99][99]，Z；s（d，e，Z）{for（；；）开关（m[x+=d][y+=e]）{c'^：r1==e；
C'>'：R-1==d；C'v'：R-1==e；C'：
R-1==d；
C'v'：
R-1==e；
C'F#，255个字符（仍然可读！）
好的，休息了一晚后，我的表现有了很大的提高：
let a=System.Console.In.ReadToEnd()
let w,c=a.IndexOf"\n"+1,a.IndexOfAny[|'^';'<';'>';'v'|]
let rec n(c,d)=
let e,s=[|-w,2;-1,3;1,0;w,1|].[d]
n(c+e,match a.[c+e]with|'/'->s|'\\'->3-s|' '->d|c->printfn"%A"(c='x');exit 0)
n(c,"^<>v".IndexOf a.[c])
let a=System.Console.In.ReadToEnd（）
设w，c=a.IndexOf“\n”+1，a.IndexOfAny[|'^'；''v'|]
让记录n（c，d）=
设e，s=[|-w，2；-1,3；1,0；w，1[d]
n（c+e，将[c+e]与|'/'->s |'\\'->3-s |'->d | c->printfn“%a”（c='x'）匹配；退出0）
n（c，“^v”。a[c]的索引）
让我们一行一行地谈
首先，将所有的输入拼凑成一个大的一维数组（二维数组可能不适合代码高尔夫；只需使用1D数组，并在索引中加/减一行的宽度，即可上移/下移一行）
接下来，我们通过索引到数组中来计算输入行的宽度“w”和起始位置“c”
现在，让我们定义“下一个”函数“n”，它采用当前位置“c”，方向“d”为0,1,2,3，表示向上、向左、向右、向下
索引ε'e'和what-new-direction-if-we-hit-a-slash's'由一个表计算。例如，如果当前方向'd'为0（向上），那么表中的第一个元素表示“-w，2”，这意味着我们将索引递减w，如果我们击中一个斜线，则新方向为2（右）
现在我们递归到下一个函数“n”，其中（1）下一个索引（“c+e”-current加epsilon）和（2）新方向，我们通过向前看来计算，看看下一个单元格中的数组中有什么。如果向前看的字符是斜杠，新方向是“s”。如果是反斜杠，新方向是3-s（我们对编码0123的选择使这一点得以实现）。如果它是一个空格，我们只需沿着同一方向“d”。如果它是任何其他字符“c”，则游戏结束，如果字符是“x”，则打印“true”，否则打印“false”
首先，我们调用递归函数'n'，初始位置为'c'，起始方向为（将方向初始编码为0123）
我想我可能还可以再删掉几个字符，但我很高兴这样（255是一个不错的数字）。Perl，166 160个字符
Perl，251 248 246 222 214 208 203 201 193 190 180 176 173 170 166-->160个字符
本次比赛结束时，Solution有166个笔划，但A.Rex找到了几种方法，可以再砍掉6个字符：
s!.!$t{$s++}=$&!ge,$s=$r+=99for<>;%d='>.^1<2v3'=~/./g;($r)=grep$d|=$d{$t{$_}},%t;
{$_=$t{$r+=(1,-99,-1,99)[$d^=3*/\\/+m</>]};/[\/\\ ]/&&redo}die/x/?true:false,$/
它在%t
的元素中搜索与Ruby中的^353个字符匹配的字符：
314277个字符
好的，红宝石256个字符，现在我完成了。很好的整数停在。：）
247个字符，我停不下来
223 203201个红宝石字符
d=x=y=-1;b=readlines.each{|l|d<0&&(d="^>v<".index l[x]if x=l.index(/[>^v<]/)
y+=1)};loop{c=b[y+=[-1,0,1,0][d]][x+=[0,1,0,-1][d]]
c==47?d=[1,0,3,2][d]:c==92?d=3-d:c==35?(p !1;exit):c<?x?0:(p !!1;exit)}
10\:@?):&4:$;{0'>^<v'$(:$=@?:*>}do;
{[1 0&--1&]$=*+:*;[{$}{3$^}{1$^}{"true "}{"false"}]@*=' \/x'?=~5\:$>}do$
d=x=y=-1；b=readlines.each{l|d^vperl219
我的perl版本有392342个字符长（我不得不
:*q&9
?!puts(*q&1?"false":"true")
:m
;
);
}
#define R return
#define C case
#define Z x,y
int c,i,j,m[99][99],Z;s(d,e,Z){for(;;)switch(m[x+=d][y+=e]){C'^':R 1==e;
C'>':R-1==d;C'v':R-1==e;C'<':R 1==d;C'#':C'x':R 0;C 92:e=-e;d=-d;C'/':c=d;
d=-e;e=-c;}}main(){while((c=getchar())>0)c==10?i=0,j++:(c==120?x=i,y=j:
i,m[i++][j]=c);puts(s(1,0,Z)|s(0,1,Z)|s(-1,0,Z)|s(0,-1,Z)?"true":"false");}
#define R return
#define C case
#define Z x,y
int c,i,j,m[99][99],Z;
s(d,e,Z)
{
for(;;)
switch(m[x+=d][y+=e]){
C'^':
R 1==e;
C'>':
R-1==d;
C'v':
R-1==e;
C'<':
R 1==d;
C'#':
C'x':
R 0;
C 92:
e=-e;
d=-d;
C'/':
c=d;
d=-e;
e=-c;
}
}
main(){
while((c=getchar())>0)
c==10?i=0,j++:
(c==120?x=i,y=j:i,m[i++][j]=c);
puts(s(1,0,Z)|s(0,1,Z)|s(-1,0,Z)|s(0,-1,Z)?"true":"false");
}
let a=System.Console.In.ReadToEnd()
let w,c=a.IndexOf"\n"+1,a.IndexOfAny[|'^';'<';'>';'v'|]
let rec n(c,d)=
let e,s=[|-w,2;-1,3;1,0;w,1|].[d]
n(c+e,match a.[c+e]with|'/'->s|'\\'->3-s|' '->d|c->printfn"%A"(c='x');exit 0)
n(c,"^<>v".IndexOf a.[c])
s!.!$t{$s++}=$&!ge,$s=$r+=99for<>;%d='>.^1<2v3'=~/./g;($r)=grep$d|=$d{$t{$_}},%t;
{$_=$t{$r+=(1,-99,-1,99)[$d^=3*/\\/+m</>]};/[\/\\ ]/&&redo}die/x/?true:false,$/
%d=split//,'>.^1<2v3' ; ($r)=grep{$d|=$d{$t{$_}}}%t
$d^=3*/\\/+m</>
$r+=(1,-99,-1,99)[$d] ; $_ = $t{$r}
/[\/\\ ]/ && redo
d=x=y=-1;b=readlines.each{|l|d<0&&(d="^>v<".index l[x]if x=l.index(/[>^v<]/)
y+=1)};loop{c=b[y+=[-1,0,1,0][d]][x+=[0,1,0,-1][d]]
c==47?d=[1,0,3,2][d]:c==92?d=3-d:c==35?(p !1;exit):c<?x?0:(p !!1;exit)}
d = x = y = -1
b = readlines.each { |l|
d < 0 && (d = "^>v<".index l[x] if x = l.index(/[>^v<]/); y += 1)
}
loop {
c = b[y += [-1, 0, 1, 0][d]][x += [0, 1, 0, -1][d]]
c == 47 ? d = [1, 0, 3, 2][d] :
c == 92 ? d = 3 - d :
c == 35 ? (p !1; exit) :
c < ?x ? 0 : (p !!1; exit)
}
board = readlines
direction = x = y = -1
board.each do |line|
if direction < 0
x = line.index(/[>^v<]/)
if x
direction = "^>v<".index line[x]
end
y += 1
end
end
loop do
x += [0, 1, 0, -1][direction]
y += [-1, 0, 1, 0][direction]
ch = board[y][x].chr
case ch
when "/"
direction = [1, 0, 3, 2][direction]
when "\\"
direction = 3 - direction
when "x"
puts "true"
exit
when "#"
puts "false"
exit
end
end
@b=map{($y,$x,$s)=($a,$-[0],$&)if/[<>^v]/;$a++;[split//]}<>;L:$_=$s;$x++if/>/;
$x--if/</;$y++if/v/;$y--if/\^/;$_=$b[$y][$x];die"true\n"if/x/;die"false\n"if
/[<>^v#]/;$s=~tr/<>^v/^v<>/if/\\/;$s=~tr/<>^v/v^></if/\//;goto L
#!/usr/bin/perl
@b = map {
($y, $x, $s) = ($a, $-[0], $&) if /[<>^v]/;
$a++;
[split//]
} <>;
L:
$_ = $s;
$x++ if />/;
$x-- if /</;
$y++ if /v/;
$y-- if /\^/;
$_ = $b[$y][$x];
die "true\n" if /x/;
die "false\n" if /[<>^v#]/;
$s =~ tr/<>^v/^v<>/ if /\\/;
$s =~ tr/<>^v/v^></ if /\//;
goto L
l='>v<^';x={'/':'^<v>','\\':'v>^<',' ':l};b=[1];r=p=0
while b[-1]:
b+=[raw_input()];r+=1
for g in l:
c=b[r].find(g)
if-1<c:p=c+1j*r;d=g
while' '<d:z=l.find(d);p+=1j**z;c=b[int(p.imag)][int(p.real)];d=x.get(c,' '*4)[z]
print'#'<c
bool Run(string input) {
var a = input.Split(new[] {Environment.NewLine}, StringSplitOptions.None);
var p = a.SelectMany((line, y) => line.Select((d, x) => new {x, y, d}))
.First(x => new[] {'v', '^', '<', '>'}.Contains(x.d));
var NEXT = new[] {
new {d = '>', dx = 1, dy = 0, s = '^', b = 'v'},
new {d = 'v', dx = 0, dy = 1, s = '<', b = '>'},
new {d = '<', dx = -1, dy = 0, s = 'v', b = '^'},
new {d = '^', dx = 0, dy = -1, s = '>', b = '<'}
}.ToDictionary(x => x.d);
while (true) {
var n = NEXT[p.d];
int x = p.x + n.dx,
y = p.y + n.dy;
var d = a[y][x];
switch (d) {
case '/': d = n.s; break;
case '\\': d = n.b; break;
case ' ': d = p.d; break;
default: return d == 'x';
}
p = new {x, y, d};
}
}
int X = a[0].Length, Y = a.Length;
var p = new {x = 0, y = 0, d = 'v'};
for (var y = 0; y < Y; y++) {
for (var x = 0; x < X; x++) {
var d = a[y][x];
switch (d) {
case 'v': case '^': case '<': case '>':
p = new {x, y, d}; break;
}
}
}
var p = a.SelectMany((line, y) => line.Select((d, x) => new {x, y, d}))
.First(x => new[] {'v', '^', '<', '>'}.Contains(x.d));
$/=%d=split//,' >/^\v';$_=<>;$s='#';{
y/v<^/>v</?do{my$o;$o.="
"while s/.$/$o.=$&,""/meg;y'/\\'\/'for$o,$s;$_=$o}:/>x/?die"true
":/>#/?die"false
":s/>(.)/$s$d{$1}/?$s=$1:1;redo}
$/ = %d = (' ' => '>', '/' => '^', '\\' => 'v');
$_ = <>;
$s="#";
if (tr/v<^/>v</) {
my $o;
$o .= "\n" while s/.$/$o .= $&, ""/meg;
tr,/\\,\\/, for $o, $s;
$_ = $o;
}
die "true\n" if />x/; die "false\n" if />#/;
$s = $1 if s/>(.)/$s$d{$1}/;
redo;
class L{static void Main(){
A=new Dictionary<Point,string>();
var l=Console.ReadLine();int y=0;
while(l!=""){var a=l.ToCharArray();
for(int x=0;x<a.Count();x++)
A.Add(new Point(x,y),l[x].ToString());
y++;l=Console.ReadLine();}new L();}
static Dictionary<Point,string>A;Point P,O,N,S,W,E;
public L(){N=S=W=E=new Point(0,-1);S.Offset(0,2);
W.Offset(-1,1);E.Offset(1,1);D();
Console.WriteLine(F());}bool F(){
var l=A[P];int m=O.X,n=O.Y,o=P.X,p=P.Y;
bool x=o==m,y=p==n,a=x&p<n,b=x&p>n,c=y&o>m,d=y&o<m;
if(l=="\\"){if(a)T(W);if(b)T(E);if(c)T(S);
if(d)T(N);if(F())return true;}
if(l=="/"){if(a)T(E);if(b)T(W);if(c)T(N);
if(d)T(S);if(F())return true;}return l=="x";}
void T(Point p){O=P;do P.Offset(p);
while(!("\\,/,#,x".Split(',')).Contains(A[P]));}
void D(){P=A.Where(x=>("^,v,>,<".Split(',')).
Contains(x.Value)).First().Key;var c=A[P];
if(c=="^")T(N);if(c=="v")T(S);if(c=="<")T(W);
if(c==">")T(E);}}
class Laser
{
private Dictionary<Point, string> Arena;
private readonly List<string> LaserChars;
private readonly List<string> OtherChars;
private Point Position;
private Point OldPosition;
private readonly Point North;
private readonly Point South;
private readonly Point West;
private readonly Point East;
public Laser( List<string> arena )
{
SplitArena( arena );
LaserChars = new List<string> { "^", "v", ">", "<" };
OtherChars = new List<string> { "\\", "/", "#", "x" };
North = new Point( 0, -1 );
South = new Point( 0, 1 );
West = new Point( -1, 0 );
East = new Point( 1, 0 );
FindLaser();
Console.WriteLine( FindTarget() );
}
private void SplitArena( List<string> arena )
{
Arena = new Dictionary<Point, string>();
int y = 0;
foreach( string str in arena )
{
var line = str.ToCharArray();
for( int x = 0; x < line.Count(); x++ )
{
Arena.Add( new Point( x, y ), line[x].ToString() );
}
y++;
}
}
private void DrawArena()
{
Console.Clear();
var d = new Dictionary<Point, string>( Arena );
d[Position] = "*";
foreach( KeyValuePair<Point, string> p in d )
{
if( p.Key.X == 0 )
Console.WriteLine();
Console.Write( p.Value );
}
System.Threading.Thread.Sleep( 400 );
}
private bool FindTarget()
{
DrawArena();
string chr = Arena[Position];
switch( chr )
{
case "\\":
if( ( Position.X == Position.X ) && ( Position.Y < OldPosition.Y ) )
{
OffSet( West );
}
else if( ( Position.X == Position.X ) && ( Position.Y > OldPosition.Y ) )
{
OffSet( East );
}
else if( ( Position.Y == Position.Y ) && ( Position.X > OldPosition.X ) )
{
OffSet( South );
}
else
{
OffSet( North );
}
if( FindTarget() )
{
return true;
}
break;
case "/":
if( ( Position.X == Position.X ) && ( Position.Y < OldPosition.Y ) )
{
OffSet( East );
}
else if( ( Position.X == Position.X ) && ( Position.Y > OldPosition.Y ) )
{
OffSet( West );
}
else if( ( Position.Y == Position.Y ) && ( Position.X > OldPosition.X ) )
{
OffSet( North );
}
else
{
OffSet( South );
}
if( FindTarget() )
{
return true;
}
break;
case "x":
return true;
case "#":
return false;
}
return false;
}
private void OffSet( Point p )
{
OldPosition = Position;
do
{
Position.Offset( p );
} while( !OtherChars.Contains( Arena[Position] ) );
}
private void FindLaser()
{
Position = Arena.Where( x => LaserChars.Contains( x.Value ) ).First().Key;
switch( Arena[Position] )
{
case "^":
OffSet( North );
break;
case "v":
OffSet( South );
break;
case "<":
OffSet( West );
break;
case ">":
OffSet( East );
break;
}
}
}
puts Board.new.validate(input)
bool S(char[]m){var w=Array.FindIndex(m,x=>x<11)+1;var s=Array.FindIndex(m,x=>x>50&x!=92&x<119);var t=m[s];var d=t<61?-1:t<63?1:t<95?-w:w;var u=0;while(0<1){s+=d;u=m[s];if(u>119)return 0<1;if(u==47|u==92)d+=d>0?-w-1:w+1;else if(u!=32)return 0>1;d=u>47?-d:d;}}
bool Simulate(char[] m)
{
var w = Array.FindIndex(m, x => x < 11) + 1;
var s = Array.FindIndex(m, x => x > 50 & x != 92 & x < 119);
var t = m[s];
var d = t < 61 ? -1 : t < 63 ? 1 : t < 95 ? -w : w;
var u = 0;
while (0 < 1)
{
s += d;
u = m[s];
if (u > 119)
return 0 < 1;
if (u == 47 | u == 92)
d += d > 0 ? -w - 1 : w + 1;
else if (u != 32)
return 0 > 1;
d = u > 47 ? -d : d;
}
}
k="<>^v"
o(Just x)=x
s y(h:t)=case b of{[]->s(y+1)t;(c:_)->(c,length a,y)}where(a,b)=break(flip elem k)h
r a = f$s 0 a where f(c,x,y)=case i(a!!v!!u)"x /\\"["true",g k,g"v^><",g"^v<>"]of{Just r->r;_->"false"}where{i x y=lookup x.zip y;j=o.i c k;u=j[x-1,x+1,x,x];v=j[y,y,y-1,y+1];g t=f(j t,u,v)}
main=do{z<-getContents;putStrLn$r$lines z}
k="<>^v" -- "key" for direction
o(Just x)=x -- "only" handle successful search
s y(h:t)=case b of -- find "start" state
[]->s(y+1)t
(c:_)->(c,length a,y)
where (a,b)=break(flip elem k)h
r a = f$s 0 a where -- "run" the state machine (iterate with f)
f(c,x,y)=case i(a!!v!!u)"x /\\"["true",g k,g"v^><",g"^v<>"] of
Just r->r
_->"false"
where
i x y=lookup x.zip y -- "index" with x using y as key
j=o.i c k -- use c as index k as key; assume success
u=j[x-1,x+1,x,x] -- new x coord
v=j[y,y,y-1,y+1] -- new y coord
g t=f(j t,u,v) -- recurse; use t for new direction
main=do
z<-getContents
putStrLn$r$lines z
m=/[<>^v]/
i={'><v^'.indexOf(it)}
n=['<':{y--},'>':{y++},'^':{x--},'v':{x++}]
a=['x':{1},'\\':{'v^><'[i(d)]},'/':{'^v<>'[i(d)]},'#':{},' ':{d}]
b=[]
System.in.eachLine {b<<it.inject([]) {r,c->if(c==~m){x=b.size;y=r.size;d=c};r<<c}}
while(d==~m){n[d]();d=a[b[x][y]]()}
println !!d
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
The shortest code by character count to input a 2D representation of a board,
and output 'true' or 'false' according to the input.
The board is made out of 4 types of tiles:
# - A solid wall
x - The target the laser has to hit
/ or \ - Mirrors pointing to a direction (depends on laser direction)
v, ^, > or < - The laser pointing to a direction (down, up, right and left
respectively)
There is only one laser and only one target. Walls must form a solid rectangle
of any size, where the laser and target are placed inside. Walls inside the
'room' are possible.
Laser ray shots and travels from it's origin to the direction it's pointing. If
a laser ray hits the wall, it stops. If a laser ray hits a mirror, it is bounces
90 degrees to the direction the mirror points to. Mirrors are two sided, meaning
both sides are 'reflective' and may bounce a ray in two ways. If a laser ray
hits the laser (^v><) itself, it is treated as a wall (laser beam destroys the
beamer and so it'll never hit the target).
"""
SOLID_WALL, TARGET, MIRROR_NE_SW, MIRROR_NW_SE, LASER_DOWN, LASER_UP, \
LASER_RIGHT, LASER_LEFT = range(8)
MIRRORS = (MIRROR_NE_SW, MIRROR_NW_SE)
LASERS = (LASER_DOWN, LASER_UP, LASER_RIGHT, LASER_LEFT)
DOWN, UP, RIGHT, LEFT = range(4)
LASER_DIRECTIONS = {
LASER_DOWN : DOWN,
LASER_UP : UP,
LASER_RIGHT: RIGHT,
LASER_LEFT : LEFT
}
ROW, COLUMN = range(2)
RELATIVE_POSITIONS = {
DOWN : (ROW, 1),
UP : (ROW, -1),
RIGHT: (COLUMN, 1),
LEFT : (COLUMN, -1)
}
TILES = {"#" : SOLID_WALL,
"x" : TARGET,
"/" : MIRROR_NE_SW,
"\\": MIRROR_NW_SE,
"v" : LASER_DOWN,
"^" : LASER_UP,
">" : LASER_RIGHT,
"<" : LASER_LEFT}
REFLECTIONS = {MIRROR_NE_SW: {DOWN : LEFT,
UP : RIGHT,
RIGHT: UP,
LEFT : DOWN},
MIRROR_NW_SE: {DOWN : RIGHT,
UP : LEFT,
RIGHT: DOWN,
LEFT : UP}}
def does_laser_hit_target(tiles):
"""
Follows a lasers trajectory around a grid of tiles determining if it
will reach the target.
Keyword arguments:
tiles --- row/column based version of a board containing symbolic
versions of the tiles (walls, laser, target, etc)
"""
#Obtain the position of the laser
laser_pos = get_laser_pos(tiles)
#Retrieve the laser's tile
laser = get_tile(tiles, laser_pos)
#Create an editable starting point for the beam
beam_pos = list(laser_pos)
#Create an editable direction for the beam
beam_dir = LASER_DIRECTIONS[laser]
#Cache the number of rows
number_of_rows = len(tiles)
#Keep on looping until an ultimate conclusion
while True:
#Discover the axis and offset the beam is travelling to
axis, offset = RELATIVE_POSITIONS[beam_dir]
#Modify the beam's position
beam_pos[axis] += offset
#Allow for a wrap around in this 2D scenario
try:
#Get the beam's new tile
tile = get_tile(tiles, beam_pos)
#Perform wrapping
except IndexError:
#Obtain the row position
row_pos = beam_pos[ROW]
#Handle vertical wrapping
if axis == ROW:
#Handle going off the top
if row_pos == -1:
#Move beam to the bottom
beam_pos[ROW] = number_of_rows - 1
#Handle going off the bottom
elif row_pos == number_of_rows:
#Move beam to the top
beam_pos[ROW] = 0
#Handle horizontal wrapping
elif axis == COLUMN:
#Obtain the row
row = tiles[row_pos]
#Calculate the number of columns
number_of_cols = len(row)
#Obtain the column position
col_pos = beam_pos[COLUMN]
#Handle going off the left hand side
if col_pos == -1:
#Move beam to the right hand side
beam_pos[COLUMN] = number_of_cols - 1
#Handle going off the right hand side
elif col_pos == number_of_cols:
#Move beam to the left hand side
beam_pos[COLUMN] = 0
#Get the beam's new tile
tile = get_tile(tiles, beam_pos)
#Handle hitting a wall or the laser
if tile in LASERS \
or tile == SOLID_WALL:
return False
#Handle hitting the target
if tile == TARGET:
return True
#Handle hitting a mirror
if tile in MIRRORS:
beam_dir = reflect(tile, beam_dir)
def get_laser_pos(tiles):
"""
Returns the current laser position or an exception.
Keyword arguments:
tiles --- row/column based version of a board containing symbolic
versions of the tiles (walls, laser, target, etc)
"""
#Calculate the number of rows
number_of_rows = len(tiles)
#Loop through each row by index
for row_pos in range(number_of_rows):
#Obtain the current row
row = tiles[row_pos]
#Calculate the number of columns
number_of_cols = len(row)
#Loop through each column by index
for col_pos in range(number_of_cols):
#Obtain the current column
tile = row[col_pos]
#Handle finding a laser
if tile in LASERS:
#Return the laser's position
return row_pos, col_pos
def get_tile(tiles, pos):
"""
Retrieves a tile at the position specified.
Keyword arguments:
pos --- a row/column position of the tile
tiles --- row/column based version of a board containing symbolic
versions of the tiles (walls, laser, target, etc)
"""
#Obtain the row position
row_pos = pos[ROW]
#Obtain the column position
col_pos = pos[COLUMN]
#Obtain the row
row = tiles[row_pos]
#Obtain the tile
tile = row[col_pos]
#Return the tile
return tile
def get_wall_pos(tiles, reverse=False):
"""
Keyword arguments:
tiles --- row/column based version of a board containing symbolic
versions of the tiles (walls, laser, target, etc)
reverse --- whether to search in reverse order or not (defaults to no)
"""
number_of_rows = len(tiles)
row_iter = range(number_of_rows)
if reverse:
row_iter = reversed(row_iter)
for row_pos in row_iter:
row = tiles[row_pos]
number_of_cols = len(row)
col_iter = range(number_of_cols)
if reverse:
col_iter = reversed(col_iter)
for col_pos in col_iter:
tile = row[col_pos]
if tile == SOLID_WALL:
pos = row_pos, col_pos
if reverse:
offset = -1
else:
offset = 1
for axis in ROW, COLUMN:
next_pos = list(pos)
next_pos[axis] += offset
try:
next_tile = get_tile(tiles, next_pos)
except IndexError:
next_tile = None
if next_tile != SOLID_WALL:
raise WallOutsideRoomError(row_pos, col_pos)
return pos
def identify_tile(tile):
"""
Returns a symbolic value for every identified tile or None.
Keyword arguments:
tile --- the tile to identify
"""
#Safely lookup the tile
try:
#Return known tiles
return TILES[tile]
#Handle unknown tiles
except KeyError:
#Return a default value
return
def main():
"""
Takes a board from STDIN and either returns a result to STDOUT or an
error to STDERR.
Called when this file is run on the command line.
"""
#As this function is the only one to use this module, and it can only be
#called once in this configuration, it makes sense to only import it here.
import sys
#Reads the board from standard input.
board = sys.stdin.read()
#Safely handles outside input
try:
#Calculates the result of shooting the laser
result = shoot_laser(board)
#Handles multiple item errors
except (MultipleLaserError, MultipleTargetError) as error:
#Display the error
sys.stderr.write("%s\n" % str(error))
#Loop through all the duplicated item symbols
for symbol in error.symbols:
#Highlight each symbol in green
board = board.replace(symbol, "\033[01;31m%s\033[m" % symbol)
#Display the board
sys.stderr.write("%s\n" % board)
#Exit with an error signal
sys.exit(1)
#Handles item missing errors
except (NoLaserError, NoTargetError) as error:
#Display the error
sys.stderr.write("%s\n" % str(error))
#Display the board
sys.stderr.write("%s\n" % board)
#Exit with an error signal
sys.exit(1)
#Handles errors caused by symbols
except (OutsideRoomError, WallNotRectangleError) as error:
#Displays the error
sys.stderr.write("%s\n" % str(error))
lines = board.split("\n")
line = lines[error.row_pos]
before = line[:error.col_pos]
after = line[error.col_pos + 1:]
symbol = line[error.col_pos]
line = "%s\033[01;31m%s\033[m%s" % (before, symbol, after)
lines[error.row_pos] = line
board = "\n".join(lines)
#Display the board
sys.stderr.write("%s\n" % board)
#Exit with an error signal
sys.exit(1)
#Handles errors caused by non-solid walls
except WallNotSolidError as error:
#Displays the error
sys.stderr.write("%s\n" % str(error))
lines = board.split("\n")
line = lines[error.row_pos]
before = line[:error.col_pos]
after = line[error.col_pos + 1:]
symbol = line[error.col_pos]
line = "%s\033[01;5;31m#\033[m%s" % (before, after)
lines[error.row_pos] = line
board = "\n".join(lines)
#Display the board
sys.stderr.write("%s\n" % board)
#Exit with an error signal
sys.exit(1)
#If a result was returned
else:
#Converts the result into a string
result_str = str(result)
#Makes the string lowercase
lower_result = result_str.lower()
#Returns the result
sys.stdout.write("%s\n" % lower_result)
def parse_board(board):
"""
Interprets the raw board syntax and returns a grid of tiles.
Keyword arguments:
board --- the board containing the tiles (walls, laser, target, etc)
"""
#Create a container for all the lines
tiles = list()
#Loop through all the lines of the board
for line in board.split("\n"):
#Identify all the tiles on the line
row = [identify_tile(tile) for tile in line]
#Add the row to the container
tiles.append(row)
#Return the container
return tiles
def reflect(mirror, direction):
"""
Returns an updated laser direction after it has been reflected on a
mirror.
Keyword arguments:
mirror --- the mirror to reflect the laser from
direction --- the direction the laser is travelling in
"""
try:
direction_lookup = REFLECTIONS[mirror]
except KeyError:
raise TypeError("%s is not a mirror.", mirror)
try:
return direction_lookup[direction]
except KeyError:
raise TypeError("%s is not a direction.", direction)
def shoot_laser(board):
"""
Shoots the boards laser and returns whether it will hit the target.
Keyword arguments:
board --- the board containing the tiles (walls, laser, target, etc)
"""
tiles = parse_board(board)
validate_board(tiles)
return does_laser_hit_target(tiles)
def validate_board(tiles):
"""
Checks an board to see if it is valid and raises an exception if not.
Keyword arguments:
tiles --- row/column based version of a board containing symbolic
versions of the tiles (walls, laser, target, etc)
"""
found_laser = False
found_target = False
try:
n_wall, w_wall = get_wall_pos(tiles)
s_wall, e_wall = get_wall_pos(tiles, reverse=True)
except TypeError:
n_wall = e_wall = s_wall = w_wall = None
number_of_rows = len(tiles)
for row_pos in range(number_of_rows):
row = tiles[row_pos]
number_of_cols = len(row)
for col_pos in range(number_of_cols):
tile = row[col_pos]
if ((row_pos in (n_wall, s_wall) and
col_pos in range(w_wall, e_wall))
or
(col_pos in (e_wall, w_wall) and
row_pos in range(n_wall, s_wall))):
if tile != SOLID_WALL:
raise WallNotSolidError(row_pos, col_pos)
elif (n_wall != None and
(row_pos < n_wall or
col_pos > e_wall or
row_pos > s_wall or
col_pos < w_wall)):
if tile in LASERS:
raise LaserOutsideRoomError(row_pos, col_pos)
elif tile == TARGET:
raise TargetOutsideRoomError(row_pos, col_pos)
elif tile == SOLID_WALL:
if not (row_pos >= n_wall and
col_pos <= e_wall and
row_pos <= s_wall and
col_pos >= w_wall):
raise WallOutsideRoomError(row_pos, col_pos)
else:
if tile in LASERS:
if not found_laser:
found_laser = True
else:
raise MultipleLaserError(row_pos, col_pos)
elif tile == TARGET:
if not found_target:
found_target = True
else:
raise MultipleTargetError(row_pos, col_pos)
if not found_laser:
raise NoLaserError(tiles)
if not found_target:
raise NoTargetError(tiles)
class LasersError(Exception):
"""Parent Error Class for all errors raised."""
pass
class NoLaserError(LasersError):
"""Indicates that there are no lasers on the board."""
symbols = "^v><"
def __str__ (self):
return "No laser (%s) to fire." % ", ".join(self.symbols)
class NoTargetError(LasersError):
"""Indicates that there are no targets on the board."""
symbols = "x"
def __str__ (self):
return "No target (%s) to hit." % ", ".join(self.symbols)
class MultipleLaserError(LasersError):
"""Indicates that there is more than one laser on the board."""
symbols = "^v><"
def __str__ (self):
return "Too many lasers (%s) to fire, only one is allowed." % \
", ".join(self.symbols)
class MultipleTargetError(LasersError):
"""Indicates that there is more than one target on the board."""
symbols = "x"
def __str__ (self):
return "Too many targets (%s) to hit, only one is allowed." % \
", ".join(self.symbols)
class WallNotSolidError(LasersError):
"""Indicates that the perimeter wall is not solid."""
__slots__ = ("__row_pos", "__col_pos", "n_wall", "s_wall", "e_wall",
"w_wall")
def __init__(self, row_pos, col_pos):
self.__row_pos = row_pos
self.__col_pos = col_pos
def __str__ (self):
return "Walls must form a solid rectangle."
def __get_row_pos(self):
return self.__row_pos
def __get_col_pos(self):
return self.__col_pos
row_pos = property(__get_row_pos)
col_pos = property(__get_col_pos)
class WallNotRectangleError(LasersError):
"""Indicates that the perimeter wall is not a rectangle."""
__slots__ = ("__row_pos", "__col_pos")
def __init__(self, row_pos, col_pos):
self.__row_pos = row_pos
self.__col_pos = col_pos
def __str__ (self):
return "Walls must form a rectangle."
def __get_row_pos(self):
return self.__row_pos
def __get_col_pos(self):
return self.__col_pos
row_pos = property(__get_row_pos)
col_pos = property(__get_col_pos)
class OutsideRoomError(LasersError):
"""Indicates an item is outside of the perimeter wall."""
__slots__ = ("__row_pos", "__col_pos", "__name")
def __init__(self, row_pos, col_pos, name):
self.__row_pos = row_pos
self.__col_pos = col_pos
self.__name = name
def __str__ (self):
return "A %s was found outside of a 'room'." % self.__name
def __get_row_pos(self):
return self.__row_pos
def __get_col_pos(self):
return self.__col_pos
row_pos = property(__get_row_pos)
col_pos = property(__get_col_pos)
class LaserOutsideRoomError(OutsideRoomError):
"""Indicates the laser is outside of the perimeter wall."""
def __init__ (self, row_pos, col_pos):
OutsideRoomError.__init__(self, row_pos, col_pos, "laser")
class TargetOutsideRoomError(OutsideRoomError):
"""Indicates the target is outside of the perimeter wall."""
def __init__ (self, row_pos, col_pos):
OutsideRoomError.__init__(self, row_pos, col_pos, "target")
class WallOutsideRoomError(OutsideRoomError):
"""Indicates that there is a wall outside of the perimeter wall."""
def __init__ (self, row_pos, col_pos):
OutsideRoomError.__init__(self, row_pos, col_pos, "wall")
if __name__ == "__main__":
main()
#!/bin/bash
declare -a TESTS
test() {
echo -e "\033[1m$1\033[0m"
tput sgr0
echo "$2" | ./lasers.py
echo
}
test \
"no laser" \
" ##########
# x #
# / #
# /#
# \\ #
##########"
test \
"multiple lasers" \
" ##########
# v x #
# / #
# /#
# \\ ^ #
##########"
test \
"no target" \
" ##########
# v #
# / #
# /#
# \\ #
##########"
test \
"multiple targets" \
" ##########
# v x #
# / #
# /#
# \\ x #
##########"
test \
"wall not solid" \
" ##### ####
# v x #
# / #
# /#
# \\ #
##########"
test \
"laser_outside_room" \
" ##########
> # x #
# / #
# /#
# \\ #
##########"
test \
"laser before room" \
" > ##########
# x #
# / #
# /#
# \\ #
##########"
test \
"laser row before room" \
" >
##########
# x #
# / #
# /#
# \\ #
##########"
test \
"laser after room" \
" ##########
# x #
# / #
# /#
# \\ #
########## >"
test \
"laser row after room" \
" ##########
# x #
# / #
# /#
# \\ #
##########
> "
test \
"target outside room" \
" ##########
x # v #
# / #
# /#
# \\ #
##########"
test \
"target before room" \
" x ##########
# v #
# / #
# /#
# \\ #
##########"
test \
"target row before room" \
" x
##########
# v #
# / #
# /#
# \\ #
##########"
test \
"target after room" \
" ##########
# v #
# / #
# /#
# \\ #
########## x"
test \
"target row after room" \
" ##########
# v #
# / #
# /#
# \\ #
##########
x "
test \
"wall outside room" \
" ##########
# # v #
# / #
# /#
# \\ x #
##########"
test \
"wall before room" \
" # ##########
# v #
# / #
# /#
# \\ x #
##########"
test \
"wall row before room" \
" #
##########
# v #
# / #
# /#
# \\ x #
##########"
test \
"wall after room" \
" ##########
# v #
# / #
# /#
# \\ x #
########## #"
test \
"wall row after room" \
" ##########
# v #
# / #
# /#
# \\ x #
##########
#"
test \
"mirror outside room positive" \
" ##########
/ # / \\ #
# #
# \\ x#
# > / #
########## "
test \
"mirrors outside room negative" \
" ##########
\\ # v x #
# / #
# /#
# \\ #
##########"
test \
"mirror before room positive" \
" \\ ##########
# / \\ #
# #
# \\ x#
# > / #
########## "
test \
"mirrors before room negative" \
" / ##########
# v x #
# / #
# /#
# \\ #
##########"
test \
"mirror row before room positive" \
" \\
##########
# / \\ #
# #
# \\ x#
# > / #
########## "
test \
"mirrors row before room negative" \
" \\
##########
# v x #
# / #
# /#
# \\ #
##########"
test \
"mirror after row positive" \
" ##########
# / \\ #
# #
# \\ x#
# > / #
########## / "
test \
"mirrors after row negative" \
" ##########
# v x #
# / #
# /#
# \\ #
########## / "
test \
"mirror row after row positive" \
" ##########
# / \\ #
# #
# \\ x#
# > / #
##########
/ "
test \
"mirrors row after row negative" \
" ##########
# v x #
# / #
# /#
# \\ #
##########
/ "
test \
"laser hitting laser" \
" ##########
# v \\#
# #
# #
#x \\ /#
##########"
test \
"mirrors positive" \
" ##########
# / \\ #
# #
# \\ x#
# > / #
########## "
test \
"mirrors negative" \
" ##########
# v x #
# / #
# /#
# \\ #
##########"
test \
"wall collision" \
" #############
# # #
# > # #
# # #
# # x #
# # #
#############"
test \
"extreme example" \
" ##########
#/\\/\\/\\ #
#\\\\//\\\\\\ #
#//\\/\\/\\\\#
#\\/\\/\\/x^#
##########"
test \
"brian example 1" \
"##########
# / \\ #
# #
#/ \\ x#
#\\> / #
##########"
test \
"brian example 2" \
"##########
# / \\#
# / \\ #
#/ \\ x#
#\\^/\\ / #
##########"
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import unittest
from lasers import *
class TestTileRecognition(unittest.TestCase):
def test_solid_wall(self):
self.assertEqual(SOLID_WALL, identify_tile("#"))
def test_target(self):
self.assertEqual(TARGET, identify_tile("x"))
def test_mirror_ne_sw(self):
self.assertEqual(MIRROR_NE_SW, identify_tile("/"))
def test_mirror_nw_se(self):
self.assertEqual(MIRROR_NW_SE, identify_tile("\\"))
def test_laser_down(self):
self.assertEqual(LASER_DOWN, identify_tile("v"))
def test_laser_up(self):
self.assertEqual(LASER_UP, identify_tile("^"))
def test_laser_right(self):
self.assertEqual(LASER_RIGHT, identify_tile(">"))
def test_laser_left(self):
self.assertEqual(LASER_LEFT, identify_tile("<"))
def test_other(self):
self.assertEqual(None, identify_tile(" "))
class TestReflection(unittest.TestCase):
def setUp(self):
self.DIRECTION = LEFT
self.NOT_DIRECTIO
#include<iostream>
#include<string>
#include<deque>
#include<cstring>
#define w v[y][x]
using namespace std;size_t y,x,*z[]={&y,&x};int main(){string p="^v<>",s;deque<string>v;
while(getline(cin,s))v.push_back(s);while(x=v[++y].find_first_of(p),!(x+1));int
i=p.find(w),d=i%2*2-1,r=i/2;do while(*z[r]+=d,w=='/'?d=-d,0:w==' ');while(r=!r,
!strchr("#x<^v>",w));cout<<(w=='x'?"true":"false");}
x=v[++y].find_first_of(p),!(x+1)
x=!0;y=0;e="^v<>#x";b=readlines;b.map{|l|(x||=l=~/[v^<>]/)||y+=1};c=e.index(b[y][x])
loop{c<2&&y+=c*2-1;c>1&&x+=2*c-5;e.index(n=b[y][x])&&(p n==?x;exit);c^=' \/'.index(n)||0}
c<2&&y+=c*2-1;c>1&&x+=(c-2)*2-1
c<2&&y+=c*2-1;c>1&&x+=2*c-5
0 => up
1 => down
2 => left
3 => right
a;b;c;d;e;function f(g){a=function(a){return g.indexOf(a)};b=a("\n")+1;a=g[c=e=a("v")>0?e:e=a("^")>0?e:e=a("<")>0?e:a(">")];d=a=="<"?-1:a==">"?1:a=="^"?-b:b;do{e=d==-1|d==1;a=g[c+=d=a=="\\"?e?b*d:d>0?1:-1:a=="/"?e?-b*d:d>0?1:-1:d];e=a=="x"}while(a!="#"^e);return e}
character; length; loc; movement; temp;
function checkMaze(maze) {
// Use a shorter indexOf function
character = function(string) { return maze.indexOf(string); }
// Get the length of the maze
length = character("\n") + 1;
// Get the location of the laser in the string
character = maze[loc = temp = character("v") > 0 ? temp :
temp = character("^") > 0 ? temp :
temp = character("<") > 0 ? temp : character(">")];
// Get the intial direction that we should travel
movement = character == "<" ? -1 :
character == ">" ? 1 :
character == "^" ? -length : length;
// Move along until we reach the end
do {
// Get the current character
temp = movement == -1 | movement == 1;
character = maze[loc += movement = character == "\\" ? temp ? length * movement : movement > 0 ? 1 : -1 :
character == "/" ? temp ? -length * movement : movement > 0 ? 1 : -1 : movement];
// Have we hit a target?
temp = character == "x";
// Have we hit a wall?
} while (character != "#" ^ temp);
// temp will be false if we hit the target
return temp;
}
<html>
<head>
<title>Code Golf - Lasers</title>
<script type="text/javascript">
a;b;c;d;e;function f(g){a=function(a){return g.indexOf(a)};b=a("\n")+1;a=g[c=e=a("v")>0?e:e=a("^")>0?e:e=a("<")>0?e:a(">")];d=a=="<"?-1:a==">"?1:a=="^"?-b:b;do{e=d==-1|d==1;a=g[c+=d=a=="\\"?e?b*d:d>0?1:-1:a=="/"?e?-b*d:d>0?1:-1:d];e=a=="x"}while(a!="#"^e);return e}
</script>
</head>
<body>
<textarea id="maze" rows="10" cols="10"></textarea>
<button id="checkMaze" onclick="alert(f(document.getElementById('maze').value))">Maze</button>
</body>
</html>
G[999],*p=G,w,z,t,*b;main(){for(;(*p++=t=getchar()^32)>=0;w=w|t-42?w:p-G)z=t^86?t^126?t^28?t^30?z:55:68:56:75,b=z?b:p;for(;t=z^55?z^68?z^56?z^75?0:w:-w:-1:1;z^=*b)b+=t;puts(*b^88?"false":"true");}
:|'v^><'.{|?}%{)}?:$@=?{.[10|?).~)1-1]=$+
:$|=' \/x'?\[.\2^.1^'true''false']=.4/!}do
10\:@?):&4:$;{0'>^<v'$(:$=@?:*>}do;
{[1 0&--1&]$=*+:*;[{$}{3$^}{1$^}{"true "}{"false"}]@*=' \/x'?=~5\:$>}do$
:\'><v^'.{\?}%{)}?:P@=?{:O[1-1\10?).~)]=P+
:P\=' \/x'?[O.2^.1^'true''false']=.4/!}do
A=open("L").read()
W=A.find('\n')+1
D=P=-1
while P<0:D+=1;P=A.find(">^<v"[D])
while D<4:P+=[1,-W,-1,W][D];D=[D,D^3,D^1,4,5][' \/x'.find(A[P])]
print D<5
import os;A=os.read(0,1e9)
print`D<5`.lower()
A=$<.read
W=A.index('
')+1
until
q=A.index(">^<v"[d=d ?d+1:0])
end
while d<4
d=[d,d^3,d^1,4,5][(' \/x'.index(A[q+=[1,-W,-1,W][d]])or 4)]
end
p 5>d
/a[{(%stdin)(r)file 99 string readline not{exit}if}loop]def a{{[(^)(>)(<)(v)]{2
copy search{stop}if pop pop}forall}forall}stopped/r count 7 sub def pop
length/c exch def[(>)0(^)1(<)2(v)3>>exch get/d exch def{/r r[0 -1 0 1]d get
add def/c c[1 0 -1 0]d get add def[32 0 47 1 92 3>>a r get c get .knownget
not{exit}if/d exch d xor def}loop a r get c get 120 eq =
let s=System.Console.In.ReadToEnd() //(Not sure how to get this to work!)
let w=s.IndexOf('\n')+1 //width
let h=(s.Length+1)/w //height
//wodge into a 2d array
let a=Microsoft.FSharp.Collections.Array2D.init h (w-1)(fun y x -> s.[y*w+x])
let p=s.IndexOfAny[|'^';'<';'>';'v'|] //get start pos
let (dx,dy)= //get initial direction
match "^<>v".IndexOf(s.[p]) with
|0->(0,-1)
|1->(-1,0)
|2->(1,0)
|_->(0,1)
let mutable(x,y)=(p%w,p/w) //translate into x,y coords
let rec f(dx,dy)=
x<-x+dx;y<-y+dy //mutate coords on each call
match a.[y,x] with
|' '->f(dx,dy) //keep going same direction
|'/'->f(-dy,-dx) //switch dx/dy and change sign
|'\\'->f(dy,dx) //switch dx/dy and keep sign
|'x'->"true"
|_->"false"
System.Console.Write(f(dx,dy))
003pv >~v> #v_"a"43g-!#v_23g03p33v>v
>39#<*v :: >:52*-!v >"rorrE",vg2*
######1 >^vp31+1g31$_03g13gp vv,,<15,
a#3 >0v vp30+1g30<>,,#3^@
######p $ 0vg34"a"< > >vp
^<v> > ^ p3<>-#v_:05g-!|>:15g-!| $
> v^ < < < >^v-g52:< $
v _ >52*"eslaf",,vv|-g53:_ v
: ^-"#">#:< #@,,,,<<>:43p0 v0 p34<
>">"-!vgv< ^0p33g31p32-1g3<
^ <#g1|-g34_v#-g34_v#-g34"><v^"<<<<
v!<^<33>13g1v>03g1-v>03g1+03p$v $$
>^ _#-v 1>g1-1v>+13pv >03p v pp
^_:"^"^#|^g30 <3# $< $<>^33
^!-"<":<>"v"v^># p#$<> $^44
^ >#^#_ :" "-#v_ ^ > ^gg
v g34$< ^!<v"/":< >$3p$^>05g43p$ ^55
>,@ |!-"\" :_$43g:">"-!|> ^$32
*v"x":< >-^ ^4g52<>:"^" -#v_^
5>-!#v_"ror"vv$p34g51:<>#| !-"<":<#|
^2,,, ,,"er"<>v #^^#<>05g43p$$^>^
>52*"eurt",,,,,@>15g4 3p$$$$ ^#
>:"v"\:"<"\: "^" -!#^_-!#^_-! ^
> ^
######
a#
######