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Conversion from Decimal to roman number

Roman numerals denote numbers based on symbols. These are commonly used nowadays. This post is based on how to convert a positive decimal number to Roman symbol. For example.

 Input    Output
 18     : XVIII
 189    : CLXXXIX
 604    : DCIV
 982    : DMLXXXII
 3000   : MMM

Write an efficient algorithm which is perform convert decimal to roman number.


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