LeetCode – Refresh – Integer to Roman

 1 class Solution {
 2 public:
 3     string getRoman(int n, char ten, char five, char one) {
 4         string result;
 5         if (n == 9) {
 6             result += one;
 7             result += ten;
 8         } else if (n >= 5) {
 9             result += five;
10             while (n-- > 5) result += one;
11         } else if (n == 4) {
12             result += one;
13             result += five;
14         } else {
15             while (n-- > 0) result += one;
16         }
17         return result;
18     }
19     string intToRoman(int num) {
20         string result;
21         result = getRoman(num/1000%10, 0, 0, ‘M‘);
22         result += getRoman(num/100%10, ‘M‘, ‘D‘, ‘C‘);
23         result += getRoman(num/10%10, ‘C‘, ‘L‘, ‘X‘);
24         result += getRoman(num%10, ‘X‘, ‘V‘, ‘I‘);
25         return result;
26     }
27 };