[LeetCode]Integer to Roman

题目描述:(链接）

Given an integer, convert it to a roman numeral.

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

解题思路：

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