[LeetCode-interview algorithm classic-Java implementation] [013-Roman to Integer (Roman to Integer)], leetcode -- java

Source: Internet
Author: User

[LeetCode-interview algorithm classic-Java implementation] [013-Roman to Integer (Roman to Integer)], leetcode -- java
[013-Roman to Integer (Roman to Integer )][LeetCode-interview algorithm classic-Java implementation] [directory indexes for all questions]Original question

Given a roman numeral, convert it to an integer.
Input is guaranteed to be within the range from 1 to 3999.

Theme

Given a roman number, convert it to the corresponding integer.
The entered number is between 1 and.

Solutions

The addition operation is performed based on the ing relationship between the number of Rome and the number of integers. If the first number is greater than the last one, the addition operation is performed.

Code Implementation
Public class Solution {public int romanToInt (String s) {int result = 0; int prev = 0; // record the value of the previous number for (int I = s. length ()-1; I>-1; I --) {switch (s. charAt (I) {case 'I': // 1 if (1 <prev) {result-= 1;} else {result + = 1;} prev = 1; break; case 'V': // 5 if (5 <prev) {result-= 5;} else {result + = 5;} prev = 5; break; case 'X': // 10 if (10 <prev) {result-= 10;} else {result + = 10;} prev = 10; break; case 'l ': // 50 if (50 <prev) {result-= 50;} else {result + = 50;} prev = 50; break; case 'C ': // 100 if (100 <prev) {result-= 100;} else {result + = 100;} prev = 100; break; case 'D ': // 500 if (500 <prev) {result-= 500;} else {result + = 500;} prev = 500; break; case 'M ': // 1000 result + = 1000; prev = 1000; break;} return result ;}
Evaluation Result

  Click the image. If you do not release the image, drag it to a position. After the image is released, you can view the complete image in the new window.

Note Please refer to the following link for more information: http://blog.csdn.net/derrantcm/article/details/46963377]

Copyright Disclaimer: This article is an original article by the blogger and cannot be reproduced without the permission of the blogger.

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.