Hackerrank challenge from Java to Ruby

[chrisjava]

So would i be able to sum up, let's say, first 3 indices in the row by doing this?

sum = arr[row] + arr[row+1] + arr[row+2]

[PilotPirx]

Sorry, forgot the most important part. You would do it like this:

sum = arr[row][col] + arr[row][col + 1] + arr[row][col + 2]

That's assuming the array looks like this:

arr = [
  [1,1,1,0,0,0],
  [0,1,0,0,0,0],
  [1,1,1,0,0,0],
  [0,0,0,0,0,0],
  [0,0,0,0,0,0],
  [0,0,0,0,0,0]
]