# Roman Numeral to Integer

Given a string `numeral`

representing a Roman numeral, convert it to an integer.

Roman numerals contain the symbols representing values in the following list:

`"I" = 1`

`"V" = 5`

`"X" = 10`

`"L" = 50`

`"C" = 100`

`"D" = 500`

`"M" = 1000`

Roman numerals are typically written largest to smallest, from left to right, and can be computed by summing up the values of all the symbols. However, in some cases, when a symbol of lower value is to the left of a symbol of higher value, then the lower value is subtracted from the higher one.

There are 6 cases where this is possible:

- When
`"I"`

is before`"V"`

, we get`4`

. - When
`"I"`

is before`"X"`

, we get`9`

. - When
`"X"`

is before`"L"`

, we get`40`

. - When
`"X"`

is before`"C"`

, we get`90`

. - When
`"C"`

is before`"D"`

, we get`400`

. - When
`"C"`

is before`"M"`

, we get`900`

.

**Constraints**

`1 ≤ n ≤ 15`

where`n`

is the length of`numeral`

`1 ≤ k ≤ 3000`

where`k`

is the number`numeral`

represents

https://binarysearch.com/problems/Roman-Numeral-to-Integer

## Examples

### Example 1

**Input**

- numeral =
`XII`

**Output**

- answer =
`12`

**Explanation**

`"XII" = 10 + 1 + 1 = 12`

### Example 2

**Input**

- numeral =
`XIV`

**Output**

- answer =
`14`

**Explanation**

`"XIV" = 10 + 4 = 14`

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