The front of old buildings sometimes show the year when they were built in roman numbers. These number are rather confusing and not easy to understand, Can you make a program that can translate any string with any roman number between 0 to 3999 back a decimal number? (an empty string should return zero).
I found this even more challenging than the reverse problem (problem 63 Encode Roman numbers) which I liked a lot and was obviously the inspiration of this problem.
Examples:
  • 'XXIII' should return 23 (XX=20 III=3)
  • 'MMXXI' should return 2021 (MM=2000 XX=20 I=1)
  • 'MDCLXVI' should return 1666 (MDC =1600 LX=60 VI=6)
  • 'CMXCIX' should return 999 (CM=900,XC=90,IX=9)
  • '' (empty string) should return 0
Only integer numbers between 0 and 3999 can be handled.
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Last Solution submitted on Sep 08, 2026

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Chris Cleveland George Berken Hong Son Lorenzo

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