CodeGolf: Brothers

Answer 1

F#, 675 chars

let R()=System.Console.ReadLine().Split([|' '|])|>Array.map int
let B(a:int[][]) r c g=
 let n=Array.init r (fun i->Array.copy a.[i])
 for i in 1..r-2 do for j in 1..c-2 do
  let e=a.[i].[j]-1
  let e=if -1=e then g else e
  if a.[i-1].[j]=e||a.[i+1].[j]=e||a.[i].[j-1]=e||a.[i].[j+1]=e then
   n.[i].[j]<-e
 n
let mutable n,r,c,k=0,0,0,0
while(n,r,c,k)<>(0,2,2,0)do
 let i=R()
 n<-i.[0]
 r<-i.[1]+2
 c<-i.[2]+2
 k<-i.[3]
 let mutable a=Array.init r (fun i->
 if i=0||i=r-1 then Array.create c -2 else[|yield -2;yield!R();yield -2|])
 for j in 1..k do a<-B a r c (n-1)
 for i in 1..r-2 do
  for j in 1..c-2 do
   printf "%d" a.[i].[j]
  printfn ""

Make the array big enough to put an extra border of "-2" around the outside - this way can look left/up/right/down without worrying about out-of-bounds exceptions.

B() is the battle function; it clones the array-of-arrays and computes the next layout. For each square, see if up/down/left/right is the guy who hates you (enemy 'e'), if so, he takes you over.

The main while loop just reads input, runs k iterations of battle, and prints output as per the spec.

Input:

3 4 4 3
0 1 2 0
1 0 2 0
0 1 2 0
0 1 2 2
4 2 3 4
1 0 3
2 1 2
0 0 0 0

Output:

2220
2101
2220
0200
103
212

Answer 2

Python 2.6, 383 376 Characters

This code is inspired by Steve Losh' answer:

import sys
A=range
l=lambda:map(int,raw_input().split())
def x(N,R,C,K):
 if not N:return
 m=[l()for _ in A(R)];n=[r[:]for r in m]
 def u(r,c):z=m[r][c];n[r][c]=(z-((z-1)%N in[m[r+s][c+d]for s,d in(-1,0),(1,0),(0,-1),(0,1)if 0<=r+s<R and 0<=c+d<C]))%N
 for i in A(K):[u(r,c)for r in A(R)for c in A(C)];m=[r[:]for r in n]
 for r in m:print' '.join(map(str,r))
 x(*l())
x(*l())

---

Haskell (GHC 6.8.2), 570 446 415 413 388 Characters

Minimized:

import Monad
import Array
import List
f=map
d=getLine>>=return.f read.words
h m k=k//(f(\(a@(i,j),e)->(a,maybe e id(find(==mod(e-1)m)$f(k!)$filter(inRange$bounds k)[(i-1,j),(i+1,j),(i,j-1),(i,j+1)])))$assocs k)
main=do[n,r,c,k]<-d;when(n>0)$do g<-mapM(const d)[1..r];mapM_(\i->putStrLn$unwords$take c$drop(i*c)$f show$elems$(iterate(h n)$listArray((1,1),(r,c))$concat g)!!k)[0..r-1];main

The code above is based on the (hopefully readable) version below. Perhaps the most significant difference with sth's answer is that this code uses Data.Array.IArray instead of nested lists.

import Control.Monad
import Data.Array.IArray
import Data.List

type Index = (Int, Int)
type Heir = Int
type Kingdom = Array Index Heir

-- Given the dimensions of a kingdom and a county, return its neighbors.
neighbors :: (Index, Index) -> Index -> [Index]
neighbors dim (i, j) =
  filter (inRange dim) [(i - 1, j), (i + 1, j), (i, j - 1), (i, j + 1)]

-- Given the first non-Heir and a Kingdom, calculate the next iteration.
iter :: Heir -> Kingdom -> Kingdom
iter m k = k // (
  map (\(i, e) -> (i, maybe e id (find (== mod (e - 1) m) $
                                    map (k !) $ neighbors (bounds k) i))) $
  assocs k)

-- Read a line integers from stdin.
readLine :: IO [Int]
readLine = getLine >>= return . map read . words

-- Print the given kingdom, assuming the specified number of rows and columns.
printKingdom :: Int -> Int -> Kingdom -> IO ()
printKingdom r c k =
  mapM_ (\i -> putStrLn $ unwords $ take c $ drop (i * c) $ map show $ elems k)
        [0..r-1]

main :: IO ()
main = do
  [n, r, c, k] <- readLine     -- read number of heirs, rows, columns and iters
  when (n > 0) $ do                -- observe that 0 heirs implies [0, 0, 0, 0]
    g <- sequence $ replicate r readLine   -- read initial state of the kingdom
    printKingdom r c $                      -- print kingdom after k iterations
      (iterate (iter n) $ listArray ((1, 1), (r, c)) $ concat g) !! k
    main                                               -- handle next test case

Answer 3

Python (420 characters)

I haven't played with code golf puzzles in a while, so I'm sure I missed a few things:

import sys
H,R,C,B=map(int,raw_input().split())
M=(1,0), (0,1),(-1, 0),(0,-1)
l=[map(int,r.split())for r in sys.stdin]
n=[r[:]for r in l[:]]
def D(r,c):
 x=l[r][c]
 a=[l[r+mr][c+mc]for mr,mc in M if 0<=r+mr<R and 0<=c+mc<C]
 if x==0and H-1in a:n[r][c]=H-1
 elif x-1in a:n[r][c]=x-1
 else:n[r][c]=x
G=range
for i in G(B):
 for r in G(R):
  for c in G(C):D(r,c)
 l=[r[:] for r in n[:]]
for r in l:print' '.join(map(str,r))

Answer 4

Lua, 291 Characters

g=loadstring("return io.read('*n')")repeat n=g()r=g()c=g()k=g()l={}c=c+1 for
i=0,k do w={}for x=1,r*c do a=l[x]and(l[x]+n-1)%n w[x]=i==0 and x%c~=0 and
g()or(l[x-1]==a or l[x+1]==a or l[x+c]==a or l[x-c]==a)and a or
l[x]io.write(i~=k and""or x%c==0 and"\n"or w[x].." ")end l=w end until n==0

Answer 5

Perl, 233 char

{$_=<>;($~,$R,$C,$K)=split;if($~){@A=map{$_=<>;split}1..$R;$x=0,
@A=map{$r=0;for$d(-$C,$C,1,-1){$r|=($y=$x+$d)>=0&$y<@A&1==($_-$A[$y])%$~
if($p=(1+$x)%$C)>1||1-$d-2*$p}$x++;($_-$r)%$~}@A
while$K--;print"@a\n"while@a=splice@A,0,$C;redo}}

The map is held in a one-dimensional array. This is less elegant than the two-dimensional solution, but it is also shorter. Contains the idiom @A=map{...}@A where all the fighting goes on inside the braces.

Answer 6

AWK - 245

A bit late, but nonetheless... Data in a 1-D array. Using a 2-D array the solution is about 30 chars longer.

NR<2{N=$1;R=$2;C=$3;K=$4;M=0}NR>1{for(i=0;i++<NF;)X[M++]=$i}END{for(k=0;k++<K;){
for(i=0;i<M;){Y[i++]=X[i-(i%C>0)]-(b=(N-1+X[i])%N)&&X[i+((i+1)%C>0)]-b&&X[i-C]-b
&&[i+C]-b?X[i]:b}for(i in Y)X[i]=Y[i]}for(i=0;i<M;)printf"%s%d",i%C?" ":"\n",
X[i++]}