diff --git a/e089.py b/e089.py new file mode 100644 index 0000000..a2fc98f --- /dev/null +++ b/e089.py @@ -0,0 +1,85 @@ +"""Develop a method to express Roman numerals in minimal form. + +The rules for writing Roman numerals allow for many ways of writing each number (see FAQ: Roman Numerals). However, there is always a "best" way of writing a particular number. + +For example, the following represent all of the legitimate ways of writing the number sixteen: + IIIIIIIIIIIIIIII + VIIIIIIIIIII + VVIIIIII + XIIIIII + VVVI + XVI + +The last example being considered the most efficient, as it uses the least number of numerals. + +The 11K text file, roman.txt (p089/roman.txt), contains one thousand numbers written in valid, but not necessarily minimal, Roman numerals; that is, they are arranged in descending units and obey the subtractive pair rule (see FAQ for the definitive rules for this problem). + +Find the number of characters saved by writing each of these in their minimal form. + +Note: You can assume that all the Roman numerals in the file contain no more than four consecutive identical units. +""" + +ROMAN_NUMERALS = { + 'I': 1, + 'V': 5, + 'X': 10, + 'L': 50, + 'C': 100, + 'D': 500, + 'M': 1000 +} + + +def roman_to_decimal(s): + # Read in roman digits in reverse + last = None + total = 0 + for c in s[::-1]: + val = ROMAN_NUMERALS[c] + if last and val < last: + total = total - val + else: + total = total + val + last = val + return total + +def decimal_to_roman(n): + roman = '' + lookup = dict([(v, k) for (k, v) in ROMAN_NUMERALS.iteritems()]) + values = sorted(ROMAN_NUMERALS.values()) + total = 0 + subtracted = False + for i in xrange(len(values)): + val = values[i] + if val == max(values): + count = n // val + roman = (lookup[val] * count) + roman + else: + nn = (n - total) % values[i + 1] + count = nn // val + if count > 3: + roman = lookup[val] + lookup[values[i + 2]] + roman + subtracted = True + else: + if count and subtracted: + count = count - 1 + subtracted = False + roman = (lookup[val] * count) + roman + total = total + nn + return roman + +def main(): + saved = 0 + with open('p089/roman.txt', 'r') as f: + while True: + line = f.readline() + if not line: + break + old = line.strip() + new = decimal_to_roman(roman_to_decimal(old)) + print roman_to_decimal(old), old, new + saved = saved + (len(old) - len(new)) + print 'Saved:', saved + +if __name__ == '__main__': + main() diff --git a/p089/roman.txt b/p089/roman.txt new file mode 100644 index 0000000..721ab99 --- /dev/null +++ b/p089/roman.txt @@ -0,0 +1,1000 @@ +MMMMDCLXXII +MMDCCCLXXXIII +MMMDLXVIIII +MMMMDXCV +DCCCLXXII +MMCCCVI +MMMCDLXXXVII +MMMMCCXXI +MMMCCXX +MMMMDCCCLXXIII +MMMCCXXXVII +MMCCCLXXXXIX +MDCCCXXIIII +MMCXCVI +CCXCVIII +MMMCCCXXXII +MDCCXXX +MMMDCCCL +MMMMCCLXXXVI +MMDCCCXCVI +MMMDCII +MMMCCXII +MMMMDCCCCI +MMDCCCXCII +MDCXX +CMLXXXVII +MMMXXI +MMMMCCCXIV +MLXXII +MCCLXXVIIII +MMMMCCXXXXI +MMDCCCLXXII +MMMMXXXI +MMMDCCLXXX +MMDCCCLXXIX +MMMMLXXXV +MCXXI +MDCCCXXXVII +MMCCCLXVII +MCDXXXV +CCXXXIII +CMXX +MMMCLXIV +MCCCLXXXVI +DCCCXCVIII +MMMDCCCCXXXIV +CDXVIIII +MMCCXXXV +MDCCCXXXII +MMMMD +MMDCCLXIX +MMMMCCCLXXXXVI +MMDCCXLII +MMMDCCCVIIII +DCCLXXXIIII +MDCCCCXXXII +MMCXXVII +DCCCXXX +CCLXIX +MMMXI +MMMMCMLXXXXVIII +MMMMDLXXXVII +MMMMDCCCLX +MMCCLIV 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