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}…

题目链接 https://leetcode.com/problems/roman-to-integer/?tab=Description   int toNumber(char ch) { switch (ch) { case 'I': return 1; case 'V': return 5; case 'X': return 10; case 'L': return 50; case 'C': return 100; case 'D': return 500; case 'M': retur…

题目: Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 思路:与12题正好相反,罗马数字基本字符集:I V X L C D M (1, 5, 10, 50, 100, 500, 1000).思路是从字符串最低位开始匹配,累加相应字符对应的阿拉伯数字,要注意的就是I,X,L(1,10,100)要判断是在左还是在右,在左就减在右就加.…

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 written as, XII, which i…

这道题是LeetCode里的第13道题. 题目说明: 罗马数字包含以下七种字符: I, V, X, L,C,D 和 M. 字符 数值 I 1 V 5 X 10 L 50 C 100 D 500 M 1000 例如, 罗马数字 2 写做 II ,即为两个并列的 1.12 写做 XII ,即为 X + II . 27 写做  XXVII, 即为 XX + V + II . 通常情况下,罗马数字中小的数字在大的数字的右边.但也存在特例,例如 4 不写做 IIII,而是 IV.数字 1 在数字 5 的左…

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…

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. 思路:有关罗马数字的相关知识可见博客Integer to roman.从左往右遍历字符串,比较当前为和下一位的值,若是当前数字比下一位大,或者当当前数字为最后时,则加上当前数字,否则减去当前数字.这就遇到一个问题,罗马数字的字符串不是按26个字母顺序来的,如何确定大小.解决办法一:写…

Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 罗马数转化成数字问题,我们需要对于罗马数字很熟悉才能完成转换.以下截自百度百科: 罗马数字是最早的数字表示方式,比阿拉伯数字早2000多年,起源于罗马. 如今我们最常见的罗马数字就是钟表的表盘符号:Ⅰ,Ⅱ,Ⅲ,Ⅳ(IIII),Ⅴ,Ⅵ,Ⅶ,Ⅷ,Ⅸ,Ⅹ,Ⅺ,Ⅻ…… 对应阿拉伯数字(就是现…