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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题目
给定一个整数，将其转换成罗马数字。
返回的结果要求在1-3999的范围内。
说明什么是 罗马数字?
https://en.wikipedia.org/wiki/Roman_numerals
https://zh.wikipedia.org/wiki/%E7%BD%97%E9%A9%AC%E6%95%B0%E5%AD%97
http://baike.baidu.com/view/42061.htm
样例4
-> IV
12
-> XII
21
-> XXI
99
-> XCIX
更多案例，请戳 http://literacy.kent.edu/Minigrants/Cinci/romanchart.htm
分析
循环判断即可
代码
public class Solution {
/**
* @param n The integer
* @return Roman representation
*/
public String intToRoman(int num) {
if(num <= 0)
return "";
String[] symbols = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
int[] nums = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
int digit = 0;
StringBuilder sb = new StringBuilder();
while(num > 0) {
int times = num/nums[digit];
num = num-times*nums[digit];
for(;times>0;times--) {
sb.append(symbols[digit]);
}
digit++;
}
return sb.toString();
}
}
