[LeetCode 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.

Ideas: based on the roman and integer relationship. We could set up a table from bigger to smaller to check the value.

class Solution {
public:
string intToRoman(int num) {
string s ;
if(num<1 || num >3999) return s;

int Integer[13] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
string Roman[13] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};

for( int i = 0; i < 13; i++){
while(num >= Integer[i]){
num -= Integer[i];
s += Roman[i];
}
}
return s;
}
};