roman-to-integer.rb

# @param {String} s
# @return {Integer}
def roman_to_int(s)
    total = 0
    roman_symbols = {"I": 1, "V": 5, "X": 10, "L": 50, "C": 100, "D": 500, "M": 1000}
    
    s.length.times do |i|
        unless s[i+1]
            total += roman_symbols[s[i].to_sym]
            next
        end
        
        total += roman_symbols[s[i].to_sym] >= roman_symbols[s[i+1].to_sym] ? roman_symbols[s[i].to_sym] : roman_symbols[s[i].to_sym]*-1
    end
    
    total
end