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Leetcode: Minimum Depth of Binary Tree

题目： Given a binary tree, find its minimum depth.The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.思路分析：二叉树多用迭代C++示例代码：/** * Definitio

leetcode

binary

tree

二叉树

示例代码

原创 2022-08-01 12:59:36 66 阅读

LeetCode: Maximum Depth of Binary Tree

题目如下：Given a binary tree, find its maximum depth.The maximum depth is the number of nodes along th

二叉树

leetcode

层序遍历

递归算法

原创 2022-08-01 12:44:33 153 阅读

Leetcode: SingleNumber I

题目：Given an array of integers, every element appears twice except for one. Find that single one.Your algorithm should have a linear runtime complexity. Could you implement it without using extra m

algorithm

位运算符

i++

异或运算

原创 2022-08-01 12:41:07 106 阅读

Leetcode: SingleNumber II

题目：Given an array of integers, every element appears three times except for one. Find that single one.

algorithm

leetcode

i++

数据

原创 2022-08-01 12:41:03 83 阅读

Leetcode: Length of Last Word

问题：Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.If the last word does not exist, return 0.解答：（这个问题不难，但

algorithm

原创 2022-08-01 12:40:59 131 阅读

LeetCode: Combinations

Given two integers n and k, return all possible combinations ofk numbers out of 1 ... n.For example,If n = 4 and k = 2, a solution is:[ [2,4], [3,4], [2,3], [1,2], [1,3], [1,4],]

递归

leetcode

迭代

i++

原创 2022-08-01 12:40:46 95 阅读

Leetcode: Swap Nodes in Pairs

题目： Given a linked list, swap every two adjacent nodes and return its head.For example, Given 1->2->3->4, you

leetcode

指针移动

c++

c#

原创 2022-08-01 12:35:27 114 阅读

LeetCode: Anagrams

问题：Given an array of strings, return all groups of strings that are anagrams.Note: All inputs will be in lower-case.分析：1.将

leetcode

Anagrams

字符串

数据集

i++

原创 2022-08-01 12:35:12 74 阅读

Leetcode: Excel Sheet Column Number

leetcode

进制

i++

十进制数字

原创 2022-08-01 12:33:51 127 阅读

Leetcode: Same Tree

题目：Given two binary trees, write a function to check if they are equal or not.Two binary trees are considered equal if they are structurally identical and the nodes have the same value.解答：bo

leetcode

ide

原创 2022-08-01 12:33:40 83 阅读

Leetcode: Excel Sheet Column Title

问题：Given a positive integer, return its corresponding column title as appear in an Excel sheet.For example: 1 -> A 2 -> B 3 -> C ... 26 -> Z 27 -> AA 28 -> AB 解答：

leetcode

转置

进制

十进制

原创 2022-08-01 12:33:36 87 阅读

Leetcode: Remove Duplicates from Sorted List

问题：Given a sorted linked list, delete all duplicates such that each element appear onlyonce.For example,Given 1->1->2,所以我们只

leetcode

两个指针

解决方案

原创 2022-08-01 12:33:31 93 阅读

Leetcode: Majority Element

问题描述： Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times.

Leetcode

示例代码

c++

i++

原创 2022-08-01 12:33:04 82 阅读

Leetcode: Intersection of Two Linked Lists

题目：Write a program to find the node at which the intersection of two singly linked lists begins.For example, the following two linked lists: A: a1 → a2 ↘

Leetcode

代码示例

i++

原创 2022-08-01 12:32:57 125 阅读

Leetcode: Compare Version Numbers

题目： Compare two version numbers version1 and version2. If version1 > version2 return 1, if version1 < version2 return -1,nd

Leetcode

i++

string类

c++

原创 2022-08-01 12:32:52 117 阅读

Leetcode: String to Integer (atoi)

题目：Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge,

leetcode

#define

ide

原创 2022-08-01 12:28:24 153 阅读

Leetcode: Factorial Trailing Zeroes

题目： Given an integer n, return the number of trailing zeroes in n!.Note: Your solution should be in logarithmic time com

leetcode

整除

质因数分解

i++

原创 2022-08-01 12:28:19 114 阅读

Leetcode: Rotate Array

题目：Rotate an array of n elements to the right by k steps.For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4]

array

数组

i++

c#

原创 2022-08-01 12:28:14 129 阅读

Leetcode: Min Stack

题目： Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.push(x) – Push element x onto stack.pop() – Removes the element on top of the stack.top() – Get

Leetcode

stack

#include

代码示例

c++

原创 2022-08-01 12:28:07 70 阅读

Leetcode: Valid Palindrome

题目： Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.For example, “A man, a plan, a canal: Panama” is a palindrome. “race a car” is not a

Leetcode

回文

ide

i++

字符串

原创 2022-08-01 12:28:00 74 阅读

Leetcode: Pascal's Triangle II

题目： Given an index k, return the kth row of the Pascal’s triangle.For example, given k = 3, Return [1,3,3,1].Note:

leetcode

pascal

杨辉三角

c++

i++

原创 2022-08-01 12:27:50 98 阅读

Leetcode: Pascal's Triangle

题目：Given numRows, generate the first numRows of Pascal's triangle.For example, given numRows = 5,Return[ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1]]杨辉三角相信是大家再熟悉不过的啦，这

Leetcode

pascal

i++

示例代码

杨辉三角

原创 2022-08-01 12:27:43 104 阅读

Leetcode: Path Sum

题目：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 given sum.For example:Given the below binary tree a

Leetcode

二叉树

深度遍历

原创 2022-08-01 12:27:38 96 阅读

Leetcode: Balanced Binary Tree

题目： Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never diffe

平衡二叉树

子树

c++

原创 2022-08-01 12:27:33 125 阅读

Leetcode: Remove Element

题目： Given an array and a value, remove all instances of that value in place and return the new length.The order of elements can be changed. It doesn’t matter what you leave beyond the new length. 这道题比

Leetcode

i++

c#

java

原创 2022-08-01 12:24:58 70 阅读

Leetcode: Remove Duplicates from Sorted Array

题目： Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.Do not allocate extra space for another array, you must do this in place wit

Leetcode

i++

数据

指针移动

原创 2022-08-01 12:24:54 109 阅读

Leetcode: Permutations II

题目： Given a collection of numbers that might contain duplicates, return all possible unique permutations.For example,[1,1,2] have the following unique permutations:[1,1,2], [1,2,1], and [2,1,1]. 这

leetcode

全排列

重复元素

c++

原创 2022-08-01 12:24:46 96 阅读

Leetcode: House Robber

题目： You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent h

leetcode

动态规划

递推公式

c++

原创 2022-08-01 12:24:36 60 阅读

Leetcode: Triangle

最近都在复习英语，看见看得头都大了，而且阅读越做分数越低！换个环境，做做Leetcode试题！题目：Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.For example, g

leetcode

动态规划

初始化

数组

原创 2022-08-01 12:24:30 75 阅读

Leetcode: Largest Number

题目： Given a list of non negative integers, arrange them such that they form the largest number.For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330.Note: The result may be very l

leetcode

c#

c++代码

python

原创 2022-08-01 12:24:16 98 阅读

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Leetcode: Minimum Depth of Binary Tree

LeetCode: Maximum Depth of Binary Tree

Leetcode: SingleNumber I

Leetcode: SingleNumber II

Leetcode: Length of Last Word

LeetCode: Combinations

Leetcode: Swap Nodes in Pairs

LeetCode: Anagrams

Leetcode: Excel Sheet Column Number

Leetcode: Same Tree

Leetcode: Excel Sheet Column Title

Leetcode: Remove Duplicates from Sorted List

Leetcode: Majority Element

Leetcode: Intersection of Two Linked Lists

Leetcode: Compare Version Numbers

Leetcode: String to Integer (atoi)

Leetcode: Factorial Trailing Zeroes

Leetcode: Rotate Array

Leetcode: Min Stack

Leetcode: Valid Palindrome

Leetcode: Pascal's Triangle II

Leetcode: Pascal's Triangle

Leetcode: Path Sum

Leetcode: Balanced Binary Tree

Leetcode: Remove Element

Leetcode: Remove Duplicates from Sorted Array

Leetcode: Permutations II

Leetcode: House Robber

Leetcode: Triangle

Leetcode: Largest Number