【Leetcode】12. Integer to Roman
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阿拉伯数字转罗马数字的思路:
(1)把所有小数字在前的组合也作为基本数字,做一个对应的数值映射表:4=1-5=IV,9=1-10=IX,40=10-50=XL,90=10-100=XC,400=100-500=CD, 900=100-1000=CM。
(2)对于阿拉伯数字n,遍历val数组,如果n>=val[i],则结果保留r[i],同时更新n=n-val[i],直到n=0为止。
public class Solution { public String intToRoman(int num) { int[] val = new int[] {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1}; String[] r = new String[] {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"}; String result = ""; while (num > 0) { for (int i = 0; i < 13; i++) { if (num >= val[i]) { result = result + r[i]; num = num - val[i]; break; } } } return result; }}Runtime:92ms
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