Integer to Roman
Given an integer, convert it to a roman numeral.
Input is guaranteed to be within the range from 1 to 3999.
Solution
Buffer the roman numbers.
Complexity
时间复杂度 O(n),空间复杂度 O(1)
Code
public class Solution {
public String intToRoman(int num) {
int[] values = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1 };
String[] numerals = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I" };
StringBuilder result = new StringBuilder();
for(int i=0; i<values.length;i++)
{
while(num>=values[i])
{
num-=values[i];
result.append(numerals[i]);
}
}
return result.toString();
}
}