leetcode— Integer to Roman
2017-12-19 20:36
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Given an integer, convert it to a roman numeral.
Input is guaranteed to be within the range from 1 to 3999.
**思路：记住几个最主要的数字的对应关系
基本字符：
I、V、X、L、C、D、M
相应的阿拉伯数字表示为：
1．5、10、50、100、500、1000**
Input is guaranteed to be within the range from 1 to 3999.
class Solution {
public String intToRoman(int num) {
String[] s1 = {"","I","II","III","IV","V","VI","VII","VIII","IX"};
String[] s2 = {"","X","XX","XXX","XL","L","LX","LXX","LXXX","XC"};
String[] s3 = {"","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"};
String[] s4 = {"","M","MM","MMM"};
String s = s4[num/1000]+s3[num/100%10]+s2[num/10%10]+s1[num%10];
return s;
}
}**思路：记住几个最主要的数字的对应关系
基本字符：
I、V、X、L、C、D、M
相应的阿拉伯数字表示为：
1．5、10、50、100、500、1000**
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