Integer to Roman

Desicription

Given an integer, convert it to a roman numeral.

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

Solution

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class Solution {
public:
    string intToRoman(int num) {
        string thousand[4] = {"", "M", "MM", "MMM"};
        string hundred[10] = {"", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"};
        string ten[10] = {"", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"};
        string one[10] = {"", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"};
        return thousand[num/1000] + hundred[(num%1000)/100] + ten[(num%100)/10] + one[num%10];
    }
};