leetcode第36题：有效的数独

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leetcode第36题：有效的数独

解题思路:按行,列,3*3方格读取元素,存入字典中.若字典中该元素的值大于1,则返回false,否则返回true. class Solution: def isValidSudoku(self, board: List[List[str]]) -> bool: rows = [{} for i in range(9)] column = [{} for i in range(9)] box = [{} for i in range(9)] for i in range(9): for j in…

leetcode第36题--Sudoku Solver

题目: Write a program to solve a Sudoku puzzle by filling the empty cells. Empty cells are indicated by the character '.'. You may assume that there will be only one unique solution. A sudoku puzzle... ...and its solution numbers marked in red. 这题相对上题值…

LeetCode第[36]题(Java)：Valid Sudoku

题目:有效的数独表难度:Medium 题目内容: Determine if a 9x9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules: Each row must contain the digits 1-9 without repetition. Each column must contain the digits 1-9 without…

36、有效的数独 | 算法（leetode，附思维导图 + 全部解法）300题

零标题:算法(leetode,附思维导图 + 全部解法)300题之(36)有效的数独前言 1)码农三少 ,一个致力于编写极简.但齐全题解(算法) 的博主. 2)文末附赠价值上百美刀资料. 一题目描述二解法总览(思维导图) 三全部解法 1 方案1 1)代码: // 方案1 "遍历法". // 技巧:遍历1次,看当前行.列.宫(即 boxList .共 9 个)是否有重复值. // 思路: // 1)状态初始化 // 2)核心:遍历整个 board ,不断将 board…

LeetCode:36. Valid Sudoku，数独是否有效

LeetCode:36. Valid Sudoku,数独是否有效 : 题目: LeetCode:36. Valid Sudoku 描述: Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules. The Sudoku board could be partially filled, where empty cells are filled with the character '.'. A partiall…

[LeetCode] 36. Valid Sudoku 验证数独

Determine if a 9x9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules: Each row must contain the digits 1-9without repetition. Each column must contain the digits 1-9 without repetition. Each of the 9 3…

【LeetCode】36. Valid Sudoku 解题报告（Python）

[LeetCode]36. Valid Sudoku 解题报告(Python) 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/valid-sudoku/description/ 题目描述: Determine if a 9x9 Sudoku board is valid. Only the filled cells need to be validated ac…

leetcode 第188题，我的解法，Best Time to Buy and Sell Stock IV

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leetcode第37题--Count and Say

题目:(据说是facebook的面试题哦) The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, ... 1 is read off as "one 1" or 11.11 is read off as "two 1s" or 21.21 is read off as "one 2, then one 1&qu…

LeetCode第[18]题(Java)：4Sum 标签：Array

题目难度:Medium 题目: Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target. Note: The solution set must not contain duplicate quadrup…

LeetCode第[1]题(Java)：Two Sum 标签：Array

题目: Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the same element twice. 翻译: 给定一组整数,两个数字的返回索引,它们的和会等于一个特定…

LeetCode的刷题利器（伪装到老板都无法diss你没有工作）

在工程效率大行其道的今天,如果不会写点代码以后也不容易在测试圈混下去.今天给大家推荐一个LeetCode的刷题利器,可以伪装到连你老板在这里走过去都无法确认你是在干活呢,还是在干活呢. LeetCode是什么 leetcode是个题库,里面有很编程多面试的题目,可以在线编译运行.难度比较高.如果自己能都做出来,对面大公司很有帮助. 网址:https://leetcode.com/(如果对英文页面不爽的可以访问对应的中文页面:https://leetcode-cn.com/) 如果想在上面训练,首…

LeetCode每天一题之两数之和

这个LeetCode刷题系列的博客权当是为自己记一下笔记吧.博客系列会从LeetCode的第一题开始刷,同时会从零开始学习[因为我就是零/(ㄒoㄒ)/~~].同时,如果有写错的地方,希望大佬们在评论区指正. LeetCode官网 LeetCode第一题首先需要一点点关于时间和空间复杂度的概念. 时间复杂度首先先简单地说一下时间复杂度:时间复杂度使用大O字母表示,不包括函数的首项和低阶项,跟n有关.比如说一个程序的运行次数如下: 运行次数时间复杂度O() 9999 O(1) 3n+9 O(n…

WEB前端面试选择题解答（共36题）

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leetcode第三题

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LeetCode 第 342 题（Power of Four）

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LeetCode 第 231 题 (Power of Two) Given an integer, write a function to determine if it is a power of two. 这个题目有个特别简单的解法.当然.可以独自想出这种方法可不简单.这样的方法可以作为一个知识点记住就好了. class Solution { public: bool isPowerOfTwo(int n) { if(n <= 0) return false; return !(n &…

LeetCode第[46]题(Java)：Permutations(求所有全排列) 含扩展——第[47]题Permutations 2

题目:求所有全排列难度:Medium 题目内容: Given a collection of distinct integers, return all possible permutations. 翻译:给定一组各不相同的整数,返回所有可能的排列. Example: Input: [1,2,3] Output: [ [1,2,3], [1,3,2], [2,1,3], [2,3,1], [3,1,2], [3,2,1] ] 我的思路:每种情况中,每一个元素只出现一次,只是之间的顺序不同,那么…

LeetCode第[1]题(Java)：Two Sum （俩数和为目标数的下标）——EASY

题目: Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the same element twice. 翻译: 给定一组整数,两个数字的返回索引,它们的和会等于一个特定…

剑指offer 面试36题

面试36题: 题:二叉搜索树与双向链表题目:输入一棵二叉搜索树,将该二叉搜索树转换成一个排序的双向链表.要求不能创建任何新的结点,只能调整树中结点指针的指向. 解题思路一:由于输入的一个二叉搜索树,其左子树大于右子树的值,这位后面的排序做了准备,因为只需要中序遍历即可,将所有的节点保存到一个列表,.对这个list[:-1]进行遍历,每个节点的right设为下一个节点,下一个节点的left设为上一个节点. 借助了一个O(n)的辅助空间解题代码:(注意:attr列表中的元素是链表节点) # -*…

LeetCode 第 342 题(Power of Four)

LeetCode 第 342 题(Power of Four) Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example: Given num = 16, return true. Given num = 5, return false. Follow up: Could you solve it without loops/recursion? 题目非常eas…

LeetCode 第 3 题(Longest Substring Without Repeating Characters)

LeetCode 第 3 题(Longest Substring Without Repeating Characters) Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which the length is 3. Given "b…

Leetcode 第 2 题(Add Two Numbers)

Leetcode 第 2 题(Add Two Numbers) 题目例如以下: Question You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linke…