Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has exactly two or zero sub-node. ...

Given a non-empty binary tree, return the average value of the nodes on each level in the form of an array. ExampleInput: 12345 3 / \9 20 / \ 15 ...

Given a non-negative integer c, your task is to decide whether there’re two integers a and b such that a^2 + b^2 = c. ExampleNo.1Input: 5 Output: True ...

Given an integer array, find three numbers whose product is maximum and output the maximum product. ExampleNo.1Input: [1,2,3] Output: 6 No.2Input: [1, ...

Given m arrays, and each array is sorted in ascending order. Now you can pick up two integers from two different arrays (each array picks one) and cal ...

You need to construct a binary tree from a string consisting of parenthesis and integers. The whole input represents a binary tree. It contains an int ...

You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way. The null node needs to be rep ...

Suppose you have a long flowerbed in which some of the plots are planted and some are not. However, flowers cannot be planted in adjacent plots - they ...

Across the pondIn Britain, when we say ‘across the pond’ or ‘the other side of the pond’ we might be referring to the Atlantic Ocean and the United St ...

Given an m * n matrix M initialized with all 0’s and several update operations. Operations are represented by a 2D array, and each operation is repres ...