LeetCode OJ - Integer to Roman

Given an integer, convert it to a roman numeral.

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

my answer：

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

        String ret="";
        int temp=0;
        while(num!=0){
        	int remain = num%10;
        	ret = Roman_table[temp][remain] + ret;
        	num/=10;
        	temp++;
        }
        return ret;
    }
}

Runtime: 12 ms