Roman numerals are constructed by converting each decimal place value from highest to lowest using these rules:
If the value does not start with
or , select the largest symbol whose value can be subtracted from the current value, append it to the result, subtract its value, and repeat for the remainder. If the value starts with
or , use its subtractive form: one smaller symbol placed before a larger one. Only the following subtractive forms are valid: ( IV),( IX),( XL),( XC),( CD), and( CM).Only powers of
( I,X,C,M) may be repeated consecutively, and at mosttimes. The symbols V,L, andDmay never be repeated. If a symbol would need to appeartimes, use the corresponding subtractive form instead.
Note: Conversion is applied digit by digit based on decimal place values. For example,
is not treated as less than ; instead, becomes XLandbecomes IX.
Constraints:
num
