[{
  "input": [
   [1, 1, 1, 0],
    [1, 0, 1, 1],
    [1, 0, 1, 1],
    [1, 1, 1, 1]
  ],
  "walls": [
    [0, 0, 0, 0],
    [0, 0, 0, 0],
    [0, 0, 1, 0],
    [0, 0, 1, 0]
  ],
  "expected": [
    [1, 1, 1, 0],
     [1, 0, 1, 1],
     [1, 0, 1000, 2],
     [1, 1, 1000, 3]
  ]
},{
  "input": [
   [1, 1, 1, 0],
    [1, 0, 1, 1],
    [1, 0, 1, 1],
    [1, 1, 1, 1]
  ],
  "walls": [
    [0, 0, 0, 0],
    [0, 0, 0, 0],
    [0, 0, 1, 0],
    [0, 0, 1, 0]
  ],
  "expected": [
    [1, 1, 1, 0],
     [1, 0, 1, 1],
     [1, 0, 1000, 2],
     [1, 1, 1000, 3]
  ]
}]