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问题描述 Given a Binary Search Tree (BST), convert it to a Greater Tree such that every key...

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问题描述 The thief has found himself a new place for his thievery again. There is only one ...

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题目描述 Invert a binary tree.**注：返回tree的镜像树 思路1 用recursive的方法，先判断if (root)然后交换其左右两个node的位置...

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问题描述 You are a professional robber planning to rob houses along a street. Each house ha...

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##问题描述 Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements...

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总算觉得Comp arch的TA没白当hhh 问题描述 The Hamming distance between two integers is the number of ...

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问题描述 Alice and Bob have candy bars of different sizes: A[i] is the size of the i-th bar...

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问题描述 Given a binary tree, you need to compute the length of the diameter of the tree. T...

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问题描述 Given two non-empty binary trees s and t, check whether tree t has exactly the sam...

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问题描述 Given two binary trees and imagine that when you put one of them to cover the othe...

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问题描述 Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (repre...

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问题描述 Given a non-empty array of integers, return the k most frequent elements. Example ...

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问题描述 Reverse a singly linked list. Example: Input: 1->2->3->4->5->NULLOutput: 5->4->3->...

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问题描述 Given a non-empty array containing only positive integers, find if the array can b...

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问题描述 Suppose you have a random list of people standing in a queue. Each person is descr...

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问题描述 Given a string s consists of upper/lower-case alphabets and empty space characters...

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问题描述 Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ ...

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问题描述 Given an input string (s) and a pattern (p), implement regular expression matching...

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问题描述 Given an array nums of n integers where n > 1, return an array output such that o...