Leetcode Solution for "Alphabet Board Path" in Ruby

alpha-board-path.rb

def alphabet_board_path(target)
    board = [
      ['a','b','c','d','e'],
      ['f','g','h','i','j'],
      ['k','l','m','n','o'],
      ['p','q','r','s','t'],
      ['u','v','w','x','y'],
      ['z']
    ]
    answer = []
    beg = [0,0]
    c=0
    target.each_char do |i|
      row = board.detect{|aa| aa.include?(i)}
      loc = [board.index(row), row.index(i)]
      x =  beg[0]-loc[0]
      y = beg[1]-loc[1]
      if(loc == [x,y])
        answer.push("!")
        c+=1
        beg = loc
      end
      x.abs.times {answer.push('D')} if x<0 
      x.abs.times {answer.push('U')} if x>0
      y.abs.times {answer.push('R')} if y<0 
      y.abs.times {answer.push('L')} if y>0 
      beg = loc
      answer.push("!") if c<1
      c=0  
    end
    p answer.join('')
end