0x00 问题描述
Roman numerals are represented by seven different symbols: I, V, X, L, C, D, and M.
罗马数字以下列字母组成
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 is simply X + II. The number twenty-seven is written as XXVII, which is XX + V + II.
例如,数字2的罗马数字为II,相当于两个1相加。12则以XII表示,24的罗马数字为XXVII,相当于XX+V+II.
Roman numerals are usually written largest to smallest from left to right. However, the numeral for four is not IIII. Instead, the number four is written as IV. Because the one is before the five we subtract it making four. The same principle applies to the number nine, which is written as IX. There are six instances where subtraction is used:
罗马数字顺序是从左到右,最左边是最大值,最右为最小值。然而阿拉伯数字4并不是以IIII来表示,罗马数字中的4是以IV表示的。同样9对应的是IV。
I can be placed before V (5) and X (10) to make 4 and 9.
X can be placed before L (50) and C (100) to make 40 and 90.
C can be placed before D (500) and M (1000) to make 400 and 900.
Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999.
系统将输入一个罗马数字,将其转化为阿拉伯数字整数输出。该输入的范围将被限制在1-3999
Example:
Input: "III"
Output: 3
Input: "IV"
Output: 4
Input: "MCMXCIV"
Output: 1994
Explanation: M = 1000, CM = 900, XC = 90 and IV = 4.
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