LeetCode 12. Integer to Roman
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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:将一个整数转化为罗马数字表示法~
分析:根据罗马数字的表示方法,我们直到罗马字符有"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"这几种,分别对应1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1。如果在这些数字之间的,比如3,那就重复3次写1:III。
所以只需要按照罗马数字表示的从大到小顺序,当num比a[i]大的时候,cnt = num / a[i],就将b[i]连接在result字符串后面cnt次。每一次循环将num取余a[i],直到num<=0为止~
class Solution {public: string intToRoman(int num) { string result = ""; int a[] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1}; string b[] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"}; int index = 0, cnt; while(num > 0) { cnt = num / a[index]; while(cnt--) result += b[index]; num = num % a[index]; index++; } return result; }};
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