题解 | #牛群的危险路径#

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     *
     * @param path string字符串
     * @return string字符串
     */
    public  String find_dangerous_cow_path(String path) {
        // write code here
        Deque<String> deque = new LinkedList<>();
        String[] strs = path.split("/");
        for (int i = 0; i < strs.length; i++) {
            if(strs[i].isEmpty()||strs[i].equals(".")){
                continue;
            }else if(strs[i].equals("..")){
                if(!deque.isEmpty()){
                    deque.pop();
                }

            }else {
                deque.push(strs[i]);
            }
        }
                StringBuilder stringBuilder = new StringBuilder();
                while(!deque.isEmpty()){
                    System.out.println(deque.peekFirst());
                    stringBuilder.insert(0,"/"+deque.removeFirst());
                }
                return stringBuilder.equals("")?"/":stringBuilder.toString();
    }

}