12. Integer to Roman

Integer to Roman

Given an integer, convert it to a roman numeral.

Input is guaranteed to be within the range from 1 to 3999.

Solution

public class Solution {
    public String intToRoman(int num) {

        int[] nums = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
        String[] symbols = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
        StringBuilder res = new StringBuilder();
        int i=0;
        while (num>0) {
            int times = num / nums[i];
            num -= nums[i]*times;
            for (; times>0; times--) {
                res.append(symbols[i]);
            }
            ++i;
        }
        return res.toString();
    }

}