new_contents: def grid_max(g):
      max = 0
      max = up(g, max)
      max = right(g, max)
      max = diag(g, max)
      return max
  
  def right(g, max):
      n = len(g[0]) - 3
      for l in g:
          for m in xrange(n):
              p = l[m] * l[m+1] * l[m+2] * l[m+3]
              if max < p:
                  max = p
      return max
  
  def up(g, max):
      n = len(g[0]) - 3
      for l in xrange(len(g) - 1):
          for m in xrange(n):
              p = g[m][l] * g[m+1][l] * g[m+2][l] * g[m+3][l]
              if max < p:
                  max = p
      return max
  
  def diag(g, max):
      n = len(g[0]) - 3
      # \
      for l in xrange(n):
          for m in xrange(n):
              p = g[l][m] * g[l+1][m+1] * g[l+2][m+2] * g[l+3][m+3]
              if max < p:
                  max = p
      # /
      for l in xrange(n, 0 , -1):
          for m in xrange(n):
              p = g[l][m] * g[l+1][m-1] * g[l+2][m-2] * g[l+3][m-3]
              if max < p:
                  max = p
      return max
  
  if __name__== '__main__':
      a = '08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08'
      b = '49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00'
      c = '81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65'
      d = '52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 36 91'
      e = '22 31 16 71 51 67 63 89 41 92 36 54 22 40 40 28 66 33 13 80'
      f = '24 47 32 60 99 03 45 02 44 75 33 53 78 36 84 20 35 17 12 50'
      g = '24 47 32 60 99 03 45 02 44 75 33 53 78 36 84 20 35 17 12 50'
      h = '32 98 81 28 64 23 67 10 26 38 40 67 59 54 70 66 18 38 64 70'
      i = '67 26 20 68 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21'
      j = '24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72'
      k = '21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95'
      l = '78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92'
      m = '16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57'
      n = '86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58'
      o = '19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40'
      p = '04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66'
      q = '88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69'
      r = '04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36'
      s = '20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16'
      t = '20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54'
      u = '01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48'
      grid = [a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u]
      for i in xrange(len(grid)):
          grid[i] = [int(s) for s in grid[i].split(' ')]
  
      print grid_max(grid)
  
subject: solve problem 11