2017-09-09 LeetCode_012 Integer to Roman

12. Integer to Roman

Given an integer, convert it to a roman numeral.

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

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solution:

class Solution {

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public:

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    string intToRoman(int num) {

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        string m[4] = {"", "M", "MM", "MMM"},

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            c[10] = {"", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"},

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            x[10] = {"", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"},

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            i[10] = {"", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"};

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        return m[num/1000]+c[(num%1000)/100]+x[(num%100)/10]+i[num%10];

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    }

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};