Integer to Roman
描述
Given an integer, convert it to a roman numeral.
Input is guaranteed to be within the range from 1 to 3999.
分析
无
代码
// Integer to Roman
// 时间复杂度O(num)，空间复杂度O(1)
class Solution {
public String intToRoman(int num) {
final int radix[] = {1000, 900, 500, 400, 100, 90,
50, 40, 10, 9, 5, 4, 1};
final String symbol[] = {"M", "CM", "D", "CD", "C", "XC",
"L", "XL", "X", "IX", "V", "IV", "I"};
StringBuilder roman = new StringBuilder();
for (int i = 0; num > 0; ++i) {
int count = num / radix[i];
num %= radix[i];
for (; count > 0; --count) roman.append(symbol[i]);
}
return roman.toString();
}
}