Integer to Roman -- LeetCode 012

Given an integer, convert it to a roman numeral.

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

Solution 1:

class Solution
{
public:
    string intToRoman(int num)
    {
　　　　　// 关键
        const int radix[] = {, , , , , ,
                                    , , , , , , };
        const string symbol[] = {"M", "CM", "D", "CD", "C", "XC",
                                "L", "XL", "X", "IX", "V", "IV", "I"};

        string roman;
        for(size_t i = ; num > ; ++i)
        {
            int count = num / radix[i];
            num %= radix[i];
            for(; count > ; --count) roman += symbol[i];
        }
        return roman;
    }
};