水中的鱼

Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the ...

A very frequent interview question. Suppose you have a tree, how could you serialize it to file and revert it back? for example,       ...

Given an array where elements are sorted in ascending order, convert it to a height balanced BST. » Solve this problem [Thoughts] If w...

Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structural...

Given  n , generate all structurally unique  BST's  (binary search trees) that store values 1... n . For example, Given  n  = 3, yo...

Given  n , how many structurally unique  BST's  (binary search trees) that store values 1... n ? For example, Given  n  = 3, there ...

Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only  distinct  numbers from the original list. For ex...