141. Linked List Cycle
https://leetcode.com/problems/linked-list-cycle
https://leetcode.com/problems/linked-list-cycle
https://leetcode.com/problems/linked-list-cycle-ii
https://leetcode.com/problems/reorder-list/
https://leetcode.com/problems/lru-cache/
https://leetcode.com/problems/insertion-sort-list
https://leetcode.com/problems/sort-list/
https://leetcode.com/problems/intersection-of-two-linked-lists
https://mech.run/docs/leetcode/1-500/swapnodesin_pairs
https://leetcode.com/problems/remove-nth-node-from-end-of-list
https://leetcode.com/problems/reverse-linked-list
https://leetcode.com/problems/delete-the-middle-node-of-a-linked-list/submissions/
https://leetcode.com/problems/merge-two-sorted-lists
https://leetcode.com/problems/merge-k-sorted-lists/
https://leetcode.com/problems/palindrome-linked-list/
https://leetcode.com/problems/delete-node-in-a-linked-list/
https://leetcode.com/problems/swap-nodes-in-pairs
https://leetcode.com/problems/reverse-nodes-in-k-group/
https://leetcode.com/problems/odd-even-linked-list
https://leetcode.com/problems/flatten-nested-list-iterator
https://leetcode.com/problems/linked-list-random-node
https://leetcode.com/problems/add-two-numbers-ii/
https://leetcode.com/problems/rotate-list/
https://leetcode.com/problems/design-linked-list/
https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/
https://leetcode.com/problems/remove-duplicates-from-sorted-list/
https://leetcode.com/problems/partition-list/
Python
https://leetcode.com/problems/reverse-linked-list-ii/