LeetCode

题目：

Given an integer, convert it to a roman numeral.
Input is guaranteed to be within the range from 1 to 3999.

思路：

把几个特殊的值指明出来。

package manipulation;

public class IntegerToRoman {

    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"};
        String res = "";
        for (int i = 0; num > 0 && i < 13; ++i) {
            int times = num / nums[i];
            num = num % nums[i];
            for (; times > 0; --times)
                res += symbols[i];
        }
        
        return res;
    }
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        IntegerToRoman i = new IntegerToRoman();
        System.out.println(i.intToRoman(19));
    }

}