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【LeetCode】013. Roman to Integer

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…

《LeetBook》leetcode题解(13):Roman to Integer[E]

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…

No.013 Roman to Integer

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…

LeetCode--No.013 Roman to Integer

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…

【LeetCode】13. Roman to Integer (2 solutions)

Roman to Integer Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 解法一:非递归 从左到右遍历每个字符,并记录上个字符来处理双字符情况即可. class Solution { public: int romanToInt(string s) { ; ; ; i < s.size(); i ++) { switch(…

C# 写 LeetCode easy #13 Roman to Integer

13.Roman to Integer Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 1000 For example, two is written as II in Roman numeral, just two one's added together. Twelve is writ…

【JAVA、C++】LeetCode 013 Roman to Integer

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…

[Leetcode]013. Roman to Integer

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.…

【一天一道LeetCode】#13. Roman to Integer

一天一道LeetCode系列 (一)题目 Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. (二)解题 和上一题相反,这题将罗马数字转换成整形数. 注意到 4,9,40,90,400,900这些特殊的数字的区别就不难写出代码了. class Solution { public: int romanToInt(string s) {…

LeetCode：12. Roman to Integer （Easy）

1. 原题链接 https://leetcode.com/problems/roman-to-integer/description/ 2. 题目要求 (1)将罗马数字转换成整数:(2)范围1-3999: 3. 关于罗马数字 罗马数字相关规则已经在之前一篇博客里写过,这里不再赘述(之前博客的传送门) 4. 解题思路 (1)这与之前第十二题Integer转换Roman虽然很相似,但处理方法并不相同.罗马数字更像是一个字符串,因此将其转换成字符数组进行处理. (2)从后向前遍历一次,结合罗马数字的组…