IntegertoRoman.java

/*
 Author:     King, wangjingui@outlook.com
 Date:       Dec 13, 2014
 Problem:    Integer to Roman
 Difficulty: Easy
 Source:     https://oj.leetcode.com/problems/integer-to-roman/
 Notes:
 Given an integer, convert it to a roman numeral.
 Input is guaranteed to be within the range from 1 to 3999.

 Solution: Buffer the roman numbers.
 */

public class Solution {
    public String intToRoman(int num) {
        int[] values = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1 };  
        String[] numerals = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I" }; 
        StringBuilder result = new StringBuilder();
        for(int i=0; i<values.length;i++)
        {
            while(num>=values[i])
            {
                num-=values[i];
                result.append(numerals[i]);
            }
        }
        return result.toString();
    }
}