This tag indicates that the challenge involves Roman numerals
This tag indicates that the challenge involves Roman numerals. Roman numerals are a compact way of representing numbers in unary.
The basics of Roman numerals:
In Roman numerals,
I stands for
M:1000. A useful mnemonic for remember the values greater than
Let Caesar Destroy Mountains (
Numbers are formed by combining symbols together and adding the values. So
IIis two ones, i.e.
XIIIis a ten and three ones, i.e.
13. There is no zero in this system, so
207, for example, is
CCVII, using the symbols for two hundreds, a five and two ones.
MLXVI, one thousand, fifty and ten, a five and a one.
In the standard form of roman numerals:
Symbols are placed from left to right in order of value, starting with the largest. However, in a few specific cases, to avoid four characters being repeated in succession (such as
XXXX) these can be reduced using subtractive notation as follows:
Ican be placed before
Xcan be placed before
Ccan be placed before
CM) according to the same pattern
An example using the above rules would be
1904: this is composed of
0(zero tens), and
4(four units). To write the Roman numeral, each of the non-zero digits should be treated separately. Thus
1,000 = M,
900 = CM, and
4 = IV. Therefore,