Last updated on October 9th, 2024 at 10:00 pm

Here, We see Simplify Path LeetCode Solution. This Leetcode problem is done in many programming languages like C++, Java, JavaScript, Python, etc. with different approaches.

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Simplify Path LeetCode Solution

Problem Statement

Given a string path, which is an absolute path (starting with a slash '/') to a file or directory in a Unix-style file system, convert it to the simplified canonical path.

In a Unix-style file system, a period '.' refers to the current directory, a double period '..' refers to the directory up a level, and any multiple consecutive slashes (i.e. '//') are treated as a single slash '/'. For this problem, any other format of periods such as '...' are treated as file/directory names.

The canonical path should have the following format:

• The path starts with a single slash '/'.
• Any two directories are separated by a single slash '/'.
• The path does not end with a trailing '/'.
• The path only contains the directories on the path from the root directory to the target file or directory (i.e., no period '.' or double period '..')

Return the simplified canonical path.

Example 1:

Input: path = "/home/"
Output: "/home"
Explanation: Note that there is no trailing slash after the last directory name.

Example 2:

Input: path = "/../"
Output: "/"
Explanation: Going one level up from the root directory is a no-op, as the root level is the highest level you can go.

Example 3:

Input: path = "/home//foo/"
Output: "/home/foo"
Explanation: In the canonical path, multiple consecutive slashes are replaced by a single one.

1. Simplify Path Leetcode Solution C++

class Solution {
public:
    string simplifyPath(string path) {
        string res, s;
        stack<string>stk;
        stringstream ss(path);
        while(getline(ss, s, '/')) {
            if (s == "" || s == ".") continue;
            if (s == ".." && !stk.empty()) stk.pop();
            else if (s != "..") stk.push(s);
        }
        while(!stk.empty()){
            res = "/"+ stk.top() + res;
            stk.pop();
        }
        return res.empty() ? "/" : res;        
    }
};

2. Simplify Path Leetcode Solution Java

class Solution {
    public String simplifyPath(String path) {
	String[] dir = path.split("/");
	String[] stack = new String[dir.length];
	int ptr = 0;
	for(int i = 0; i < dir.length; i++){
		if(dir[i].equals(".") || dir[i].equals("")){
			continue;
		}else if(dir[i].equals("..")){
			if(ptr > 0) ptr--;
		}else{
			stack[ptr] = dir[i];
			ptr++;
		}
	}
	StringBuilder result = new StringBuilder();
	for(int i = 0; i < ptr; i++){
		result.append("/");
		result.append(stack[i]);
	}
	return result.length() == 0 ? "/" : result.toString();    
    }
}

3. Simplify Path Leetcode Solution JavaScript

var simplifyPath = function(path) {
    let stack = [];
    path = path.split('/');
    
    for (let i=0;i<path.length;i++) {
        if (path[i]=='.' || path[i]=='') continue;
        if (path[i]=='..') stack.pop();
        else stack.push(path[i]);
    }
    
    return '/'+stack.join('/');    
};

4. Simplify Path Leetcode Solution Python

class Solution(object):
    def simplifyPath(self, path):
        stack = []
        for token in path.split('/'):
            if token in ('', '.'):
                pass
            elif token == '..':
                if stack: stack.pop()
            else:
                stack.append(token)
        return '/' + '/'.join(stack)