rotate image题目描述You are given an n x n 2D matrix representing an image.Rotate the image by 90 degrees (clockwise).Fol...

unique path题目描述A robot is located at the top-left corner of a m x n grid (marked ‘Start’ in the diagram below).The ro...

unique binary search trees题目描述Given n, how many structurally unique BST’s (binary search trees) that store values 1…n...

Same Tree题目描述Given two binary trees, write a function to check if they are equal or not.Two binary trees are consider...

Roman to Integer题目描述Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1...

populating next right pointers in each node题目描述题目描述 Given a binary tree 12345struct TreeLinkNode { TreeLinkNode...

题目描述Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tree is define...