Given an absolute path for a file (Unix-style), simplify it.
For example,
path = "/home/"
, => "/home"
path = "/a/./b/../../c/"
, => "/c"
Corner Cases:
- Did you consider the case where path =
"/../"
?
In this case, you should return"/"
. - Another corner case is the path might contain multiple slashes
'/'
together, such as"/home//foo/"
.
In this case, you should ignore redundant slashes and return"/home/foo"
.
思路:简单题,Unix文件的根目录为"/","."表示当前目录,".."表示上级目录
public class Solution {
public String simplifyPath(String path) {
String []strs=path.split("/");
StringBuilder sb=new StringBuilder("");
LinkedList<String> ll=new LinkedList<String>();
for(String str:strs){
if(str.equals(".")) continue;
else if(str.equals("..")&&!ll.isEmpty()) {
ll.pollLast();
}else if(str.length()>0&&!str.equals("..")){
ll.add(str);
}
}
if(ll.isEmpty())return "/";
for(String str:ll){
sb.append("/");
sb.append(str);
}
return sb.toString();
}
}