【题目】
Given an absolute path for a file (Unix-style), simplify it.
For example,
path = "/home/"
, => "/home"
path = "/a/./b/../../c/"
, => "/c"
"/../"
?"/"
.‘/‘
together,
such as "/home//foo/"
."/home/foo"
.题意:简化Unix下的文件路径,包括多余斜杠的去除,当前目录(./)的去除,以及父目录(../)的替代。
题目给的Tags是栈,但我觉得用个队列更方便些,这样简化后的目录就不用倒着生成了。
【Java代码】
public class Solution { public String simplifyPath(String path) { LinkedList<String> queue = new LinkedList<String>(); String[] names = path.split("/"); for (int i = 0; i < names.length; i++) { if ("".equals(names[i]) || ".".equals(names[i])) continue; if ("..".equals(names[i])) { if (!queue.isEmpty()) { queue.pollLast(); } } else { queue.add(names[i]); } } StringBuilder newPath = new StringBuilder(); while (!queue.isEmpty()) { newPath.append("/"); newPath.append(queue.pollFirst()); } if (newPath.length() == 0) return "/"; return newPath.toString(); } }
原文地址:http://blog.csdn.net/ljiabin/article/details/44900601