12.整数转罗马数字

class Solution {
    public String intToRoman(int num) {
        int[] values={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 sb=new StringBuilder();
        for(int i=0;i<values.length&&num>0;i++){
            while(values[i]<=num){
                num-=values[i];
                sb.append(symbols[i]);
            }
        }
        return sb.toString();

    }
}