题目:
Given a linked list, swap every two adjacent nodes and return its head.
For example,Given 1->2->3->4, you should return the list as 2->1->4->3.
Your algorithm should use only constant space. You may not modify the values in the list, only nodes
HTML code:
CSS code:
Input [type = "file"] {/* General settings: introduce an image background and set it to the center. The size is the same as the button size, and the mouse pointer is hand */width: 40px; Height: 40px; Background: url(img.jpg)
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