题目

给定一个整数，将其转换成罗马数字。

返回的结果要求在1-3999的范围内。

样例4
-> IV

12
-> XII

21
-> XXI

99
-> XCIX

分析

循环判断即可

代码

public class Solution {
    /**
     * @param n The integer
     * @return Roman representation
     */
    public String intToRoman(int num) {
        if(num <= 0)
            return "";
        
        String[] symbols = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
        int[] nums = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
        
        int digit = 0;
        StringBuilder sb = new StringBuilder();
        while(num > 0) {
            int times = num/nums[digit];
            num = num-times*nums[digit];
            
            for(;times>0;times--) {
                sb.append(symbols[digit]);
            }
            digit++;
        }
        return sb.toString();
    }
}