[LeetCode] Simplify Path solution report, leetcodesimplify

Source: Internet
Author: User

[LeetCode] Simplify Path solution report, leetcodesimplify

[Question]

Given an absolute path for a file (Unix-style), simplify it.

For example,
Path ="/home/", =>"/home"
Path ="/a/./b/../../c/", =>"/c"

Click to show corner cases.

Corner Cases:

  • Did you consider the case where path ="/../"?
    In this case, you shoshould return"/".
  • Another corner case is the path might contain multiple slashes'/'Together, such"/home//foo/".
    In this case, you shoshould ignore redundant slashes and return"/home/foo".

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[Resolution]

Anyone who has used Linux should be familiar with this, but note that the result of/../is/, that is, the upper-level directory of the root directory or the root directory.

[Java code]

public class Solution {    public String simplifyPath(String path) {        Stack<String> stack = new Stack<String>();                int len = path.length();        int start = 0;        int i = 0;                while (i < len) {            while (i < len && path.charAt(i) == '/') {                i++;            }                        start = i;            while (i < len && path.charAt(i) != '/') {                i++;            }                        if (i > start) {                String part = path.substring(start, i);                                if (part.equals("..")) {                    if (!stack.isEmpty()) stack.pop();                } else if (!part.equals(".")) {                    stack.push(part);                }            }        }                if (stack.isEmpty()) {            return "/";        }                String res = "";        while (!stack.isEmpty()) {            res = "/" + stack.pop() + res;        }                return res;    }}


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