Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123Outpu...
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[LeetCode]7. Reverse Integer整数反转
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[LeetCode]6. ZigZag ConversionZ 字形变换
The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows li...
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[LeetCode]5. Longest Palindromic Substring最长回文子串
Given a string s, find the longest palindromic substring in s. You may assume that the ...
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一次同步方法的失败与原因总结
synchronized关键字可以设置同步方法和同步块，同步方法会对调用对象this上锁，所有线程进入前都需要获取这个锁，这里我拿一个错误样例来做示范 Thread-0取出8...
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java线程的状态变换下面将会针这张图对线程的状态转换来做解释 在操作系统的课程中把线程大致分为了3个状态1.就绪状态（线程对资源上锁，但未分配时间片，等待cpu分配，随时可以运行）2.运行状态（...
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SQL语句训练16-20
16题目描述统计出当前各个title类型对应的员工当前薪水对应的平均工资。结果给出title以及平均工资avg。CREATE TABLE salaries (emp_no i...
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[LeetCode]4. Median of Two Sorted Arrays寻找两个有序数组的中位数
There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the medi...
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SQL语句训练11-15
11.题目描述获取所有员工当前的manager，如果当前的manager是自己的话结果不显示，当前表示to_date='9999-01-01'。结果第一列给出当前员工的emp...
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[LeetCode]3. Longest Substring Without Repeating Characters无重复字符的最长子串
Given a string, find the length of the longest substring without repeating characters. ...
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SQL语句训练6-10
题目地址https://www.nowcoder.com/activity/oj 6.查找所有员工入职时候的薪水情况，给出emp_no以及salary， 并按照emp_no进...
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SQL语句训练1-5
题目地址https://www.nowcoder.com/activity/oj 1.题目描述查找最晚入职员工的所有信息CREATE TABLE employees (emp...
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[LeetCode]2. Add Two Numbers两数相加
You are given two non-empty linked lists representing two non-negative integers. The di...
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[LeetCode]1. Two Sum两数之和
Given an array of integers, return indices of the two numbers such that they add up to ...
