12. 整数转罗马数字

题目链接

这道题力扣题解上面给出了很多解法，贪心是目前逻辑最简单且效率高的。
先把最大值1000替换，替换完成再替换900，以此类推……
C++:

class Solution { 
public:
    string intToRoman(int num) { 
        vector<int> key = { 1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
        vector<string> value = { "M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
        string ans = "";
        for(int i = 0; i < 13; i++)
        { 
            while(num >= key[i])
            { 
                ans += value[i];
                num-=key[i];
            }
        }
        return ans;
    }
};

python：

class Solution:
    def intToRoman(self, num: int) -> str:
        key = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1]
        value = ["M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"]
        ans = ""
        for i in range(0, 13):
            while num >= key[i]:
                ans += value[i]
                num -= key[i]
        return ans

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