Save the princess! https://www.hackerrank.com/challenges/saveprincess

princess.rb

# Test cases used
#
# DOWN LEFT
# 3
# ---
# -m-
# p--

# UP RIGHT
# 3
# --p
# -m-
# ---


# Read input
grid = []

gets.to_i.times do
  buf = gets.scan /./
  grid << buf
  buf = []
end

# Find coordinates
player   = {}
princess = {}

grid.each_with_index do |row, rowIdx|
  playerColIdx = row.find_index("m") || -1
  prinColIdx   = row.find_index("p") || -1

  player   = { row: rowIdx, col: playerColIdx } if playerColIdx >= 0
  princess = { row: rowIdx, col: prinColIdx}    if prinColIdx >= 0
end

# Calculate moves
until player[:row] == princess[:row]
  prinAbove = player[:row] > princess[:row]
  puts (prinAbove) ? 'UP' : 'DOWN'
  player[:row] += prinAbove ? -1 : 1
end

until player[:col] == princess[:col]
  prinLeft = player[:col] > princess[:col]
  puts (prinLeft) ? 'LEFT' : 'RIGHT'
  player[:col] += prinLeft ? -1 : 1
end