leetcode难度及频率

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leetcode难度及频率

1 Two Sum 2 5 array sort set Two Pointers 2 Add Two Numbers 3 4 linked list Two Pointers Math 3 Longest Substring Without Repeating Characters 3 2 string Two Pointers hashtable 4 Median of Two S…

转载自:LeetCode Question Difficulty Distribution 1 Two Sum 2 5 array sort set Two Pointers 2 Add Two Numbers 3 4 linked list Two Pointers Math 3 Longest Substring Without Repeating Characters 3 2 string Two Poin…

LeetCode难度与出现频率

转载自:LeetCode Question Difficulty Distribution 1 Two Sum 2 5 array sort set Two Pointers 2 Add Two Numbers 3 4 linked list Two Pointers Math 3 Longest Substring Without Repeating Characters 3 2 string Two Pointers …

LeetCode难度和面试频率（转）

转自:http://www.cnblogs.com/ywl925/p/3507945.html ID Question Diff Freq Data Structure Algorithms 1 Two Sum 2 5 array sort set Two Pointers 2 Add Two Numbers 3 4 linked list Two Pointers Math 3 Longest Substring With…

[Leetcode]895.最大频率栈

Problem 实现 FreqStack,模拟类似栈的数据结构的操作的一个类. FreqStack 有两个函数: push(int x),将整数 x 推入栈中. pop(),它移除并返回栈中出现最频繁的元素. 如果最频繁的元素不只一个,则移除并返回最接近栈顶的元素. 示例: 输入: ["FreqStack","push","push","push","push","push","…

leetcode之 median of two sorted arrays

这是我做的第二个leetcode题目,一开始以为和第一个一样很简单,但是做的过程中才发现这个题目非常难,给人一种“刚上战场就踩上地雷挂掉了”的感觉.后来搜了一下leetcode的难度分布表(leetcode难度及面试频率)才发现,该问题是难度为5的问题,真是小看了它!网上搜了很多答案,但是鲜见简明正确的解答,唯有一种寻找第k小值的方法非常好,在此整理一下. 首先对leetcode的编译运行吐槽一下:貌似没有超时判断,而且small和large的数据集相差很小.此题一开始我采用最笨的方法去实现,利…

leetcode题库

leetcode题库 #题名题解通过率难度出现频率 1 两数之和 46.5%简单2 两数相加 35.5%中等3 无重复字符的最长子串 31.1%中等4 寻找两个有序数组的中位数 35.9%困难5 最长回文子串 26.9%中等6 Z 字形变换 44.5%中等7 整数反转 33.0%简单8 字符串转换整数 (atoi) 17.9%中等9 回文数 56.5%简单10 正则表达式匹配 24.6%困难11 盛最多水的容器 …

leetcode刷题笔记08 字符串转整数 (atoi)

题目描述实现 atoi,将字符串转为整数. 在找到第一个非空字符之前,需要移除掉字符串中的空格字符.如果第一个非空字符是正号或负号,选取该符号,并将其与后面尽可能多的连续的数字组合起来,这部分字符即为整数的值.如果第一个非空字符是数字,则直接将其与之后连续的数字字符组合起来,形成整数. 字符串可以在形成整数的字符后面包括多余的字符,这些字符可以被忽略,它们对于函数没有影响. 当字符串中的第一个非空字符序列不是个有效的整数:或字符串为空:或字符串仅包含空白字符时,则不进行转换. 若函数不能执行有…

C#刷遍Leetcode面试题系列连载（1） - 入门与工具简介

目录为什么要刷LeetCode 刷LeetCode有哪些好处? LeetCode vs 传统的 OJ LeetCode刷题时的心态建设 C#如何刷遍LeetCode 选项1: VS本地Debug + 在线验证后提交选项2: VS Code本地Debug + 在 LeetCode 插件中验证和提交为什么要刷LeetCode 大家都知道,很多对算法要求高一点的软件公司,比如美国的FLAGM (Facebook.LinkedIn.Amazon/Apple.Google.Microsoft),或国…

[链表]LeetCode 25 K组一个翻转链表

LeetCode 25 k组一个翻转链表 TITLE 示例 1: 输入:head = [1,2,3,4,5], k = 2 输出:[2,1,4,3,5] 示例 2: 输入:head = [1,2,3,4,5], k = 3 输出:[3,2,1,4,5] 示例 3: 输入:head = [1,2,3,4,5], k = 1 输出:[1,2,3,4,5] 示例 4: 输入:head = [1], k = 1 输出:[1] (PS:还是加上title吧不然太难受了) 前言:LeetCode难度hard…

SQL-数据库刷题

因是个人总结,只列出对自己有用的或较难的: 下面这道题,第一次拿到,我尝试用开窗函数 ROW_NUMBER()OVER() 编号,但是发现不能够处理好连续的问题, 上网查找了别人的解法记录下来,其实原理是把 Logs 看成三张表,每张表之间关联 -1 ,然后筛选出 Num 相等的编写一个 SQL 查询,查找所有至少连续出现三次的数字. +----+-----+ | Id | Num | +----+-----+ | 1 | 1 | | 2 | 1 | | 3 | 1 | | 4 | 2…

面试算法爱好者书籍/OJ推荐

面试算法爱好者书籍/OJ推荐这个书单也基本适用于准备面试. 一.教科书基本上一般的算法课本介绍的范围都不会超出算法导论和算法引论的范围.读完这两本书,其它的算法课本大致翻翻也就知道是什么货色了. 1. 算法导论这本书的内容用三个字来总结.就是伟光正. 基本上囊括了经常使用算法的方方面面,证明巨细无遗,十分适合刚開始学习的人阅读. 可是这本书的一大问题就是,证明尽管具体.却从未解释算法背后的理由.仅仅告诉你怎样去做,却从未探讨过为何如此去做. 2.算法引论(Introduction to A…

leecode100热题 HOT 100（2）

# 题名题解通过率难度出现频率 142 环形链表 II 43.3% 中等 146 LRU缓存机制 43.3% 中等 148 排序链表 61.7% 中等 152 乘积最大子序列 35.2% 中等 155 最小栈 49.7% 简单 160 相交链表 47.6% 简单 169 求众数 60.3% 简单 198 打家劫舍 41.4% 简单…

leecode100热题 HOT 100

# 题名题解通过率难度出现频率 1 两数之和 46.5% 简单 2 两数相加 35.5% 中等 3 无重复字符的最长子串 31.1% 中等 4 寻找两个有序数组的中位数 35.9% 困难 5 最长回文子串 26.9% 中等 10 正则表达式匹配 24.6% 困难 11 盛最多水的容器 57.3% 中等 15 三数之和 23.8%…

[LeetCode] Sort Characters By Frequency 根据字符出现频率排序

Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: "tree" Output: "eert" Explanation: 'e' appears twice while 'r' and 't' both appear once. So 'e' must appear before both 'r' and 't'. Th…

LeetCode 451. Sort Characters By Frequency （根据字符出现频率排序）

Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: "tree" Output: "eert" Explanation: 'e' appears twice while 'r' and 't' both appear once. So 'e' must appear before both 'r' and 't'. Th…

每日温度（LeetCode Medium难度算法题）题解

LeetCode 题号739中等难度每日温度题目描述: 根据每日气温列表,请重新生成一个列表,对应位置的输入是你需要再等待多久温度才会升高超过该日的天数.如果之后都不会升高,请在该位置用 0 来代替. 例如,给定一个列表 temperatures = [73, 74, 75, 71, 69, 72, 76, 73],你的输出应该是 [1, 1, 4, 2, 1, 1, 0, 0]. 提示:气温列表长度的范围是 [1, 30000].每个气温的值的均为华氏度,都是在 [30, 100] …

[LeetCode] 895. Maximum Frequency Stack 最大频率栈

Implement FreqStack, a class which simulates the operation of a stack-like data structure. FreqStack has two functions: push(int x), which pushes an integer xonto the stack. pop(), which removes and returns the most frequent element in the stack. If…

[LeetCode] 451. Sort Characters By Frequency 根据字符出现频率排序

Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: "tree" Output: "eert" Explanation: 'e' appears twice while 'r' and 't' both appear once. So 'e' must appear before both 'r' and 't'. Th…

LeetCode.1170-比较字符串中最小字符的出现频率(Compare Strings by Frequency of the Smallest Char)

这是小川的第412次更新,第444篇原创看题和准备今天介绍的是LeetCode算法题中Easy级别的第263题(顺位题号是1170).在一个非空字符串s上定义一个函数f(s),该函数计算s中最小字符的出现频率.例如,如果s ="dcce",则f(s)= 2,因为最小字符为"c",其频率为2. 现在,给定字符串数组queries和words,返回一个整数数组answer, 其中每个answer[i]是使得f(queries[i]) < f(W)的单词数量,其…

[LeetCode] Word Frequency 单词频率

Write a bash script to calculate the frequency of each word in a text file words.txt. For simplicity sake, you may assume: words.txt contains only lowercase characters and space ' ' characters. Each word must consist of lowercase characters only. Wor…

LeetCode 5 Longest Palindromic Substring manacher算法,最长回文子序列,string.substr(start,len) 难度:2

https://leetcode.com/problems/longest-palindromic-substring/ manacher算法相关:http://blog.csdn.net/ywhorizen/article/details/6629268 class Solution { public: string longestPalindrome(string s) { char ch[2001];int p[2001]; ch[2*s.size()] = 0; for(int i =…

LeetCode 6 ZigZag Conversion 模拟难度:0

https://leetcode.com/problems/zigzag-conversion/ The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility) P A H N A P L S I I G Y…

LeetCode 7 Reverse Integer int:2147483647-2147483648 难度:2

https://leetcode.com/problems/reverse-integer/ class Solution { public: int inf = ~0u >> 1; int reverse(int x) { if(x == 0)return 0; long long tx = x; long long ans = 0; for(int i = 0;tx;i++){ ans = ans * 10 + tx % 10; tx /= 10; } return int(ans) ==…

LeetCode 201 Bitwise AND of Numbers Range 位运算难度:0

https://leetcode.com/problems/bitwise-and-of-numbers-range/ [n,m]区间的合取总值就是n,m对齐后前面一段相同的数位的值比如 5:101 7:111 结果就是 4:100 class Solution { public: int rangeBitwiseAnd(int m, int n) { int len = 0; long long tmp = 1; for(;tmp <= n || tmp <= m;len++){tmp&l…

LeetCode 3 Longest Substring Without Repeating Characters 区间,想法难度:1

https://leetcode.com/problems/longest-substring-without-repeating-characters/ 思路:从某点结束所能取到的最早开头是到目前出现倒数第二次的字符的最末位置后一位如图:(S代表起点,T代表终点) abcabcab **S*T 假设现在在4位,向前找,a出现的倒数第二次在0位,b出现的在1位,所以可以从2位开始取 class Solution { public: int lengthOfLongestSubstring(st…

LeetCode 2 Add Two Numbers 模拟,读题难度:0

https://leetcode.com/problems/add-two-numbers/ 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 linked…

LeetCode 177 Nth-Highest Salary mysql,取第n条数据,limit子句难度:1

https://leetcode.com/problems/nth-highest-salary/ ATTENTION:limit 子句只能接受int常量,不能接受运算式 CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT BEGIN SET N = N - 1; RETURN ( # Write your MySQL query statement below. select DISTINCT Salary from Employee…

LeetCode 176 Second Highest Salary mysql,select 嵌套难度:1

https://leetcode.com/problems/second-highest-salary/ Write a SQL query to get the second highest salary from the Employee table. +----+--------+ | Id | Salary | +----+--------+ | 1 | 100 | | 2 | 200 | | 3 | 300 | +----+--------+ For example, given th…

LeetCode 175 Combine Two Tables mysql,left join 难度:0