#!/usr/bin/env ruby
# encoding: UTF-8

@table = [
    ['0','0','0','0','0','0','0','0','0','0','0','0','0'],
    ['0','1','1','1','1','1','1','1','1','0','0','0','0'],
    ['0','0','1','0','0','0','1','0','1','1','0','0','0'],
    ['0','1','1','0','0','1','0','0','0','1','1','0','0'],
    ['0','1','1','1','1','1','1','1','1','0','1','0','0'],
    ['0','0','0','0','0','0','0','0','1','0','1','0','0'],
    ['0','1','1','1','1','1','1','0','1','0','1','0','0'],
    ['0','1','0','0','0','0','1','0','1','0','1','0','0'],
    ['0','1','1','1','1','0','1','0','1','0','1','0','0'],
    ['0','S','1','0','1','0','1','1','1','0','1','1','1'],
    ['0','0','0','0','0','0','0','0','0','0','0','0','0']
]

def find_start_pos(table, start_symbol='S')
    table.each_with_index { |row,index_row|
        row.each_with_index { |cell,index_cell|
            return [index_row, index_cell] if cell.eql?(start_symbol)
        }
    }
    return nil
end

puts find_start_pos(@table).inspect