Course Schedule II
There are a total of n courses you have to take, labeled from 0 to n - 1.
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There are a total of n courses you have to take, labeled from 0 to n - 1.
Implement an algorithm to delete a node in the middle of a singly linked list, given only access to that node.
Write a function to delete a node (except the tail) in a singly linked list, given only access to that node.
Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST.
Given a binary tree, flatten it to a linked list in-place.