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.
题目大意：
将一个给定的阿拉伯数字转换成罗马数字。
思路：
这题看到的时候，想的太多。
其实很简单，将千位，百位，十位，个位都表示出来，然后组合即可。
代码如下：
class Solution {
public:
string intToRoman(int num) {
string thousands[4] = {"","M","MM","MMM"};
string hundreds[10] = {"","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"};
string tens[10] = {"","X","XX","XXX","XL","L","LX","LXX","LXXX","XC"};
string units[10] = {"","I","II","III","IV","V","VI","VII","VIII","IX"};
string * hits[4] = {units,tens,hundreds,thousands};
string result;
int index = 0;
while (num > 0)
{
result = hits[index][num % 10] + result;
num = num / 10;
index++;
}
return result;
}
};总结：
有时候题目没有那么难，不要自己搞的很复杂。问题简单化。简单化。。。
2016-08-19 15:16:29
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