摘要： 题目描述： Given an array where elements are sorted in ascending order, convert it to a height balanced BST. For this problem, a height-balanced binary tre 阅读全文

摘要： 题目描述： Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root) 阅读全文

摘要： 题目描述： Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the fart 阅读全文

摘要： 题目描述： Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree [1,2,2,3,4,4,3] is 阅读全文

摘要： 题目描述： Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally 阅读全文

摘要： 题目描述： Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note: You may assume that nums1 has enough space (s 阅读全文

摘要： 题目描述： Given a sorted linked list, delete all duplicates such that each element appear only once. For example, Given 1->1->2, return 1->2. Given 1->1-> 阅读全文

摘要： 题目描述： Implement int sqrt(int x). Compute and return the square root of x. x is guaranteed to be a non-negative integer. 本题让我们写一个类似sqrt()的函数，不过返回值和输入值都 阅读全文

摘要： 题目描述： You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can 阅读全文

摘要： 题目描述： Given two binary strings, return their sum (also a binary string). For example, a = "11" b = "1" Return "100". 本题给我们两个字符串形式的二进制数，让我们计算相加之后的结果。 解 阅读全文