All Posts

Given `head`, the head of a linked list, determine if the linked list has a cycle in it.

茅檐低小，溪上青青草。

Given a string `s` and a dictionary of strings `wordDict`, add spaces in `s` to construct a sentence where each word is a valid dictionary word.

少年不识愁滋味，爱上层楼。

Given a string `s` and a dictionary of strings `wordDict`, return `true` if `s` can be segmented into a space-separated sequence of one or more dictionary words.

世事一场大梦，人生几度秋凉？

random pointer, which could point to any node in the list, or `null`.

春未老，风细柳斜斜。

缺月挂疏桐，漏断人初静。

元丰六年十月十二日夜，解衣欲睡，月色入户，欣然起行。