【leetcode】Integer to Roman

Integer to Roman
Given an integer, convert it to a roman numeral.
Input is guaranteed to be within the range from 1 to 3999.
 

         ,        ；(1)    Ⅰ、X 、C       ,        ,               ,       ；            。(2)        V 、L 、D                             ；                  ,      。(3)V   X          Ⅰ。(4)L   C          ×。(5)D   M            C 

欲張りアルゴリズムを利用する
 

 1 class Solution {

 2 public:

 3     string intToRoman(int num) {

 4        

 5         string result="";

 6         string symbol[]={"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};    

 7         int value[]=    {1000,900,500,400, 100, 90,  50, 40,  10, 9,   5,  4,   1};

 8        

 9         int i=0;

10         while(num!=0)

11         {

12             while(num>=value[i])

13             {

14                 num=num-value[i];

15                 result+=symbol[i];

16             }

17             i++;

18         }

19         return result;

20     }

21 };