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Problem of the day

You are given a string * 's'* that represents a Roman number. Convert the Roman number to an integer and return it.

Roman numerals are represented by seven different symbols: I, V, X, L, C, D, and M.

```
Symbol Value
I 1
V 5
X 10
L 50
C 100
D 500
M 1000
```

```
3 is written as III in Roman numeral, just three ones added together. 13 is written as XIII, which is simply X + III. The number 25 is written as XXV, which is XX + V
```

Detailed explanation

```
The first line contains a string ‘roman’ representing the number's roman number representation.
```

```
The only line contains a single integer denoting the integer value of the given roman number.
```

```
Do not print anything, just return an integer denoting the equivalent integer of the given roman number
It is guaranteed that the string input is one of the characters of I, V, X, L, C, D, M.
It is guaranteed that the integer value of the given roman number will not exceed 3999.
```

```
XII
```

```
12
```

```
We know that ‘X’ is 10, and we have 2 ‘I’ after it. Therefore the number is 12
```

```
XC
```

```
90
```

```
1 <= roman.length <= 15
Time limit: 1 second
```

```
Can you solve this in O(N) time?
```