Last updated on October 5th, 2024 at 08:55 pm

Here, We see Integer to Roman LeetCode Solution. This Leetcode problem is done in many programming languages like C++, Java, JavaScript, Python, etc. with different approaches.

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Integer to Roman LeetCode Solution

Problem Statement

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

1. Integer to Roman LeetCode Solution C++

class Solution {
public:
    string intToRoman(int num) {
        string ones[] = {"","I","II","III","IV","V","VI","VII","VIII","IX"};
        string tens[] = {"","X","XX","XXX","XL","L","LX","LXX","LXXX","XC"};
        string hrns[] = {"","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"};
        string ths[]={"","M","MM","MMM"};
        return ths[num/1000] + hrns[(num%1000)/100] + tens[(num%100)/10] + ones[num%10];
    }
};

2. Integer to Roman LeetCode Solution Java

class Solution {
    public String intToRoman(int num) {
        String[] ones = {"", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"};
        String[] tens = {"", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"};
        String[] hrns = {"", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"};
        String[] ths = {"", "M", "MM", "MMM"};

        return ths[num / 1000] + hrns[(num % 1000) / 100] + tens[(num % 100) / 10] + ones[num % 10];
    }
}

3. Integer to Roman Solution JavaScript

var intToRoman = function(num) {
    const ones = ["", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"];
    const tens = ["", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"];
    const hrns = ["", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"];
    const ths = ["", "M", "MM", "MMM"];
    return ths[Math.floor(num / 1000)] + hrns[Math.floor((num % 1000) / 100)] + tens[Math.floor((num % 100) / 10)] + ones[num % 10];
};

4. Integer to Roman Solution Python

class Solution:
    def intToRoman(self, num):
        ones = ["", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"]
        tens = ["", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"]
        hrns = ["", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"]
        ths = ["", "M", "MM", "MMM"]
        return ths[num / 1000] + hrns[(num % 1000) / 100] + tens[(num % 100) / 10] + ones[num % 10]