【LeetCode算法练习（C++）】Integer to Roman

题目：
Given an integer, convert it to a roman numeral.
Input is guaranteed to be within the range from 1 to 3999.
ps:
I = 1;
V = 5;
X = 10;
L = 50;
C = 100;
D = 500;
M = 1000;

链接：Integer to Roman
解法：贪心，每次选择能表示的最大值

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

Runtime: 45 ms