在一次正常的shutdown -r now之后,服务器启动不起来了,登录界面显示recovering journal,主要报错信息如下所示:
/dev/sda2:recovering journal
/dev/sda2:Clearn...
You are in emergency mode. After logging in, type journalc…
一句话,深度搜索所有路径,判断路径是否伪回文
# Definition for a binary tree node.
# class TreeNode:
# def __init__(self, val0, leftNone, rightNone):
# self.val val
# self.left left
# self.right right
clas…