13. Roman to Integer Total Accepted: 95998 Total Submissions: 234087 Difficulty: Easy Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 思路: 根据上一篇的关于罗马数字的解释,我们可以知道,在罗马数字中左减右加的原则,所以当较小的数在较大的数前面时…

13. Roman to Integer Total Accepted: 95998 Total Submissions: 234087 Difficulty: Easy Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 思路: 根据上一篇的关于罗马数字的解释,我们可以知道,在罗马数字中左减右加的原则,所以当较小的数在较大的数前面时…

Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 解题思路: 类似上题,方法多多,本题直接给出上题中字典匹配的代码: JAVA实现: static public int romanToInt(String s) { int num=0; String Roman[][] = { {"", "I", &q…

Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 题解: 只要知道罗马数字的规律即可 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   1.相同的数字连写,所表示的数等于这些数字相加得到的数,如:Ⅲ = 3: 2.小的数字在大的数字的右边,所表示的数等于这些数字相加得到的…

public class Solution { public int romanToInt(String s) { if(s == null || s.length() == 0) return 0; int len = s.length(); HashMap<Character,Integer> map = new HashMap<Character,Integer>(); map.put('I',1); map.put('V',5); map.put('X',10); map.…

给定一个罗马数字,将其转换成整数. 返回的结果要求在 1 到 3999 的范围内. 详见:https://leetcode.com/problems/roman-to-integer/description/ class Solution { public: int romanToInt(string s) { int res=0; map<char, int> m{{'I', 1}, {'V', 5}, {'X', 10}, {'L', 50}, {'C', 100}, {'D', 500}…

我现在在做一个叫<leetbook>的免费开源书项目,力求提供最易懂的中文思路,目前把解题思路都同步更新到gitbook上了,需要的同学可以去看看 书的地址:https://hk029.gitbooks.io/leetbook/ 013. Roman to Integer 问题 Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. S…

Roman to Integer Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 首先学习一下罗马数字的规则: 羅馬數字共有7個,即I(1).V(5).X(10).L(50).C(100).D(500)和M(1000).按照下述的規則可以表示任意正整數.需要注意的是罗马数字中没有“0”,與進位制無關.一般認為羅馬數字只用來記數,而…

Roman to Integer Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 思路:首先要学一下罗马数字是怎么表示的,参见百度百科 其实看了上面罗马数字的介绍,可以建一个对应表 把数字和字母对应起来.遇到 I X C且后面字母的数字更大时 减去当前数字,否则加上. int romanToInt(string s) { ; ];…

Given a roman numeral, convert it to an integer. The answer is guaranteed to be within the range from 1 to 3999. Have you met this question in a real interview? Yes Clarification What is Roman Numeral? https://en.wikipedia.org/wiki/Roman_numerals htt…