# Integer to Roman – Leetcode Solution

In this post, we are going to solve the 12. Integer to Roman problem of Leetcode. This problem 12. Integer to Roman is a Leetcode medium level problem. Let’s see code, 12. Integer to Roman.

## Problem

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``````

For example, `2` is written as `II` in Roman numeral, just two one’s added together. `12` is written as `XII`, which is simply `X + II`. The number `27` is written as `XXVII`, which is `XX + V + II`.

Roman numerals are usually written largest to smallest from left to right. However, the numeral for four is not `IIII`. Instead, the number four is written as `IV`. Because the one is before the five we subtract it making four. The same principle applies to the number nine, which is written as `IX`. There are six instances where subtraction is used:

• `I` can be placed before `V` (5) and `X` (10) to make 4 and 9.
• `X` can be placed before `L` (50) and `C` (100) to make 40 and 90.
• `C` can be placed before `D` (500) and `M` (1000) to make 400 and 900.

Given an integer, convert it to a roman numeral.

### Example 1 :

``````
Input: num = 3
Output: "III"
Explanation: 3 is represented as 3 ones.
``````

### Example 2 :

``````
Input: num = 58
Output: "LVIII"
Explanation: L = 50, V = 5, III = 3.
``````

### Example 3 :

``````
Input: num = 1994
Output: "MCMXCIV"
Explanation: M = 1000, CM = 900, XC = 90 and IV = 4.
``````

### Constraints

• `1 <= num <= 3999`

Now, let’s see the code of 12. Integer to Roman – Leetcode Solution.

# Integer to Roman – Leetcode Solution

### 12. Integer to Roman – Solution in Java

```class Solution {
public String intToRoman(int num) {
int[] values = {1000,900,500,400,100,90,50,40,10,9,5,4,1};
String[] strs = {"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};

StringBuilder sb = new StringBuilder();

for(int i=0;i<values.length;i++) {
while(num >= values[i]) {
num -= values[i];
sb.append(strs[i]);
}
}
return sb.toString();
}
}```

### 12. Integer to Roman – Solution in C++

```class Solution {
public:
string intToRoman(int num)
{
string res;
string sym[] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
int val[] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};

for(int i=0; num != 0; i++)
{
while(num >= val[i])
{
num -= val[i];
res += sym[i];
}
}

return res;
}
};```

### 12. Integer to Roman– Solution in Python

```class Solution(object):
def intToRoman(self, num):
values = [ 1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1 ]
numerals = [ "M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I" ]
res = ""
for i, v in enumerate(values):
res += (num//v) * numerals[i]
num %= v
return res
```

Note: This problem 12. Integer to Roman is generated by Leetcode but the solution is provided by CodingBroz. This tutorial is only for Educational and Learning purpose.